Zhou v. Zhang ( 2020 )


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    YUN ZHOU v. HAO ZHANG
    (SC 20146)
    Robinson, C. J., and Palmer, D’Auria, Mullins,
    Kahn and Vertefeuille, Js.
    Syllabus
    The plaintiff, whose marriage to the defendant had been dissolved, appealed,
    challenging the trial court’s custody orders and claiming that the trial
    court improperly declined to enforce the parties’ purported agreement
    to revoke an earlier postnuptial agreement and incorrectly determined
    that the postnuptial agreement was enforceable. Approximately six years
    into the parties’ marriage, during which they had two children, the
    parties, after seeking and obtaining the advice of counsel, entered into
    a postnuptial agreement pursuant to which they agreed that, if either
    party sought a divorce between certain specified dates, the plaintiff
    would receive a certain amount of alimony and a specified distribution
    of marital property. Thereafter, the plaintiff filed for divorce when the
    postnuptial agreement was effective, and the parties entered into divorce
    mediation. The parties retained S as a mediator. The defendant agreed
    to retain S in reliance on S’s representation on S’s website that mediation
    was voluntary and that any party could withdraw from mediation without
    sacrificing his or her rights. Moreover, the mediation agreement between
    the parties and S provided that the parties agreed to keep all statements
    made and materials and documents prepared and disclosed during medi-
    ation confidential and that this confidentiality would extend to any
    future judicial proceedings. Shortly after mediation commenced, the
    plaintiff sent an e-mail to S and the defendant, requesting a revocation
    of the parties’ postnuptial agreement. S responded in an e-mail addressed
    to both the plaintiff and the defendant that he could help with that
    matter but that the ultimate separation agreement that the parties would
    reach at the conclusion of mediation would govern and would effectively
    override the parties’ postnuptial agreement. S nevertheless prepared a
    revocation agreement, which the parties signed after making full disclose
    to one another regarding their financial information. Although the plain-
    tiff received legal advice from her own attorney in conjunction with the
    signing of the revocation agreement, the defendant attempted to obtain
    but was unsuccessful in securing legal advice from an independent
    attorney prior to signing the revocation agreement. Mediation ultimately
    ended without the parties reaching a separation agreement, and the
    matter was tried to the court. The trial court heard testimony from
    H, a court-appointed psychologist who performed a forensic custody
    evaluation, and B, the guardian ad litem for the children, among other
    witnesses. The trial court determined that, with the exception of one
    provision that was severable from the remainder of the postnuptial
    agreement, that agreement was enforceable. The trial court also deter-
    mined that the agreement purporting to revoke the postnuptial agree-
    ment was unenforceable because, inter alia, the defendant had no legal
    counsel when he signed the revocation agreement, the defendant relied
    on a provision in the mediation agreement signed by both parties that
    all materials prepared during mediation, presumably including the pur-
    ported revocation of the postnuptial agreement, would remain confiden-
    tial and were to be used solely in an effort to obtain a complete settlement
    that never occurred, and the defendant relied on S’s representations on
    his website that the defendant could withdraw from mediation at any
    time without sacrificing his rights, including those previously guaranteed
    in the postnuptial agreement. The trial court rendered judgment dissolv-
    ing the parties’ marriage, awarding alimony and a share of the marital
    assets to the plaintiff in accordance with the parties’ postnuptial agree-
    ment, and awarding the parties joint legal and physical custody of the
    children but granting the defendant final decision-making authority as
    to matters concerning the children about which the parties disagreed.
    On the plaintiff’s appeal, held:
    1. The trial court correctly concluded that the parties’ agreement purporting
    to revoke their postnuptial agreement was unenforceable: the defen-
    dant’s purported understanding that the revocation agreement would
    not be binding unless the parties reached a full and final settlement of the
    disputed issues was supported by S’s representations to the defendant
    on S’s website, in S’s e-mail to the parties during mediation, and in the
    mediation agreement, and the trial court’s finding that the defendant’s
    understanding was based on those representations was amply supported
    by his testimony; accordingly, the revocation agreement was unenforce-
    able against the defendant over his objection because a full and final
    resolution of the issues during mediation was a condition precedent to
    the enforcement of the revocation agreement, and it was undisputed
    that no such resolution ever occurred; moreover, there was no merit
    to the plaintiff’s claim that the trial court’s consideration of S’s represen-
    tations on his website, in the e-mail to the parties, and in the mediation
    agreement for the purpose of ascertaining the defendant’s understanding
    and intent with respect to the revocation agreement violated the parol
    evidence rule, as that rule does not prevent a party from relying on
    extrinsic evidence to establish the existence of a condition precedent
    to the formation of a contract, and, therefore, the trial court properly
    considered parol evidence in evaluating the defendant’s claim that the
    revocation agreement was not binding in the absence of a final settle-
    ment agreement.
    2. The plaintiff could not prevail on her claim that the trial court had
    incorrectly determined that the parties’ postnuptial agreement was
    enforceable because it was fair and equitable at the time of execution
    and was not unconscionable at the time of dissolution: the trial court,
    in considering the entirety of the evidence, reasonably concluded that
    the plaintiff’s decision to enter into the postnuptial agreement was volun-
    tary and not the product of duress; moreover, the evidence supported
    the trial court’s finding that the plaintiff understood her rights and
    obligations under the postnuptial agreement notwithstanding its length
    and complexity, as the plaintiff was highly educated, had independent
    counsel during the negotiation and execution of that agreement, and
    acknowledged in the agreement her complete understanding of the
    effects of the agreement; furthermore, the plaintiff failed to identify a
    single change of circumstance since the execution of the postnuptial
    agreement that would warrant the conclusion that its enforcement at
    the time of dissolution would be unconscionable.
    3. The trial court did not abuse its discretion when, in its custody orders,
    it granted the defendant final decision-making authority with respect
    to the parties’ children in situations in which the parties were unable to
    agree: notwithstanding the plaintiff’s claim that the trial court improperly
    based its custody orders on the testimony of B, the guardian ad litem,
    on the ground that B testified that she had not seen the children in two
    years, there was nothing in the record to suggest that B did not conduct
    an investigation into the best interests of the children during the pen-
    dency of the dissolution, because, even though B met with the children
    only once, shortly after her appointment, due to their tender years and
    to keep them removed from their parents’ marital conflicts, B was in
    regular communication with the parties, read the reports prepared by
    H, the court-appointed psychologist, and consulted with him about his
    findings, and attended all court proceedings and depositions; moreover,
    the plaintiff had a full and fair opportunity to cross-examine B about
    any possible deficiencies concerning the time she spent with the children
    and how, if at all, any such deficiencies impaired her ability to form a
    legitimate opinion as to their best interests, and the plaintiff failed to
    demonstrate that she was prejudiced by B’s limited contact with the
    children; furthermore, H, who spent far more time evaluating the chil-
    dren, largely agreed with B’s observations and recommendations, and
    the trial court’s granting of final decision-making authority to the defen-
    dant was based on its finding that the defendant had more insight into the
    children’s developmental needs, activities, education and environment,
    which in turn was based on the testimony of B as well as other witnesses.
    Argued November 14, 2018—officially released February 11, 2020
    Procedural History
    Action for the dissolution of a marriage, and for other
    relief, brought to the Superior Court in the judicial dis-
    trict of Stamford-Norwalk, where the case was trans-
    ferred to the Regional Family Trial Docket at Mid-
    dletown and tried to the court, Gould, J.; judgment
    dissolving the marriage and granting certain other relief,
    from which the plaintiff appealed. Affirmed.
    Gaetano Ferro, with whom was Olivia M. Hebens-
    treit, for the appellant (plaintiff).
    Kenneth J. Bartschi, with whom were Scott T. Garos-
    shen and, on the brief, Wayne Effron and Reuben Mid-
    ler, for the appellee (defendant).
    Campbell D. Barrett and Johanna S. Katz filed a
    brief for the guardian ad litem.
    Opinion
    PALMER, J. The plaintiff, Yun Zhou, appeals from
    the judgment of the trial court dissolving her marriage
    to the defendant, Hao Zhang. On appeal, the plaintiff
    claims that the trial court (1) improperly declined to
    enforce the parties’ purported written revocation of
    their postnuptial agreement1 (revocation agreement),
    (2) incorrectly determined that the postnuptial agree-
    ment was enforceable, and (3) improperly awarded the
    parties joint legal and physical custody of their minor
    children, with the defendant having final decision-mak-
    ing authority. We reject the plaintiff’s claims and, there-
    fore, affirm the judgment of the trial court.
    The record reveals the following relevant facts, as
    found by the trial court and supplemented by the record,
    and procedural history. The parties were married in
    2006 and have two children, a son and a daughter, who
    were born in 2006 and 2008, respectively. ‘‘The plaintiff
    . . . is in good health. She, like the defendant, is a
    native of China and a permanent resident of the United
    States.2 She has a doctoral degree in mechanical and
    nuclear engineering from the University of California,
    Berkeley. She was employed as a research fellow at
    the University of Maryland and at the John F. Kennedy
    School of Government at Harvard University from 2007
    [until] 2013. Her highest salary from those positions at
    that time was $50,000 per year. In addition, she worked
    as a private consultant from 2012 through 2014, earning,
    at her highest point from both positions, income of
    $77,500 a year. She has published numerous papers and
    articles in the field of nuclear engineering. She has not
    worked outside of the home since 2014. She is currently
    studying for a master’s degree in public administration
    at Columbia University. She plans to resume a career
    in public policy analysis or research after obtaining her
    master’s degree . . . . Based on the foregoing, the
    [court] finds that the plaintiff has an annual earning
    capacity of $77,500.
    ‘‘The defendant . . . [also] is in good health. He has
    a doctoral degree in computer science from the Univer-
    sity of California, Berkeley. He is employed as a manag-
    ing director for Two Sigma Investments in New York
    City. His base salary is $250,000 a year, according to
    his most recent financial affidavit.3
    ‘‘The parties are . . . joint owners of the marital resi-
    dence . . . in Greenwich . . . . The property has a
    fair market value of $3.1 million, and is encumbered by
    a mortgage in the amount of $2,011,311, yielding equity
    in the amount of $1,088,689. In addition, the defendant
    maintains two rental properties for himself, one in New
    York City and another in Greenwich . . . with a total
    monthly rental fee of $14,475. . . .
    ‘‘The [parties’] children are enrolled in myriad activi-
    ties, with [the son] involved [in] tennis, piano, water
    polo, and chess, and [the daughter] involved in swim-
    ming, flute, art and dance.’’ (Footnote added; foot-
    note altered.)
    On February 25, 2012, after seeking and obtaining
    the advice of counsel, disclosing to one another their
    assets and liabilities, and exchanging financial affida-
    vits, the parties entered into and signed a properly
    acknowledged postnuptial agreement. That agreement
    provides that, if one of the parties commenced a dissolu-
    tion action between February 1, 2013, and February 1,
    2015, the plaintiff would receive ‘‘$350,000 per year
    ($29,167 per month) of alimony [for] . . . a time period
    equal to one half the length of the parties’ marriage as
    measured from the marriage date to the date of the
    commencement of the [dissolution] [a]ction.’’ (Internal
    quotation marks omitted.) The plaintiff also would
    receive the marital residence and one third of the par-
    ties’ aggregate net worth4 as of the date of the dissolu-
    tion decree. The postnuptial agreement further pro-
    vides: ‘‘If the market price of the house less the
    mortgage loan exceeds . . . one third of the [p]arties’
    [a]ggregate [n]et [w]orth, the [plaintiff] will not receive
    any portion of either party’s assets. Otherwise, the
    [plaintiff] will acquire the amount of [one third] of the
    [p]arties’ [a]ggregate [n]et [w]orth less the equity [in
    the] marital [residence] (the market price of the marital
    [residence] less the mortgage loan).’’ Paragraph 8.1 of
    the postnuptial agreement permits revocation ‘‘if made
    in writing and executed with the same formality as [the]
    [a]greement.’’ In addition, the postnuptial agreement
    has a severability clause, which provides that, if ‘‘any
    provision, clause, section or paragraph of [the] [a]gree-
    ment is invalid, is void or unenforceable for any reason,
    it shall be deemed severable from the remainder of
    the [a]greement.’’
    Thereafter, the parties concluded that their marriage
    had broken down irretrievably, and, on October 23,
    2013, the plaintiff filed for divorce. In an effort to reach a
    mutually agreeable resolution of the matter, the parties
    decided to enter into mediation. Upon receiving the
    names of two prospective mediators from the plaintiff,
    the defendant visited the website of one of them, Mau-
    rice Segall. Among other things, Segall’s website con-
    tained the following representations about the advan-
    tages of mediation: ‘‘The couple has control over the
    process, and control over the decisions that affect
    [their] lives and the lives of [their] children.’’ (Emphasis
    in original.) ‘‘With the help of the mediator, the couple
    is able to make their own fully informed decisions.’’
    (Emphasis in original.) ‘‘Mediation is informal and con-
    fidential.’’ (Emphasis in original.) ‘‘Mediation is entirely
    voluntary. Anyone can leave mediation at any time,
    without sacrificing any of [his or her] rights.’’ (Emphasis
    in original.) In reliance on this language, the defendant
    agreed to retain Segall, and, in October, 2013, Segall
    and the parties signed a mediation agreement, which
    provided in relevant part: ‘‘The [p]arties agree to keep
    confidential all statements made during the mediation,
    as well as all written, photographic, electronic or
    printed material and documents prepared or presented
    during the mediation, except that either [p]arty may
    share that information with his or her attorney. This
    agreement regarding confidentiality shall pertain to all
    circumstances, including but not limited to any civil
    and criminal proceedings.’’
    Soon after mediation commenced, the plaintiff
    informed the defendant that she favored revoking the
    parties’ postnuptial agreement. According to the defen-
    dant, he told the plaintiff that, ‘‘under the umbrella of
    the mediation, we could try this [revocation] and see
    if we can negotiate without the postnuptial [agree-
    ment].’’ On December 20, 2013, the plaintiff sent Segall
    and the defendant an e-mail inquiring as to whether
    Segall could assist the parties in revoking the postnup-
    tial agreement. In an e-mail response to the parties
    that same day, Segall stated: ‘‘Yes, I can help with the
    [postnuptial] matter; however, as a practical matter the
    ultimate separation agreement that you’ll reach will
    contain the terms that will govern, and would effectively
    override the [postnuptial agreement]. [Let’s] discuss
    this when we next meet.’’ Segall then proceeded to
    prepare a document entitled ‘‘Revocation of Postnup-
    tial Agreement.’’
    Prior to signing the revocation agreement, the parties
    again made full disclosure to one another of their assets
    and liabilities and exchanged financial affidavits. In a
    series of e-mails beginning and concluding with Segall’s
    e-mails to the parties dated January 10 and 17, 2014,
    respectively, Segall and the parties discussed the draft-
    ing of the revocation agreement and scheduled a time
    to sign it. During this period, the plaintiff’s attorney,
    Andrew Nemiroff, advised the plaintiff on the revoca-
    tion. In particular, he advised the plaintiff to have Segall
    remove language in the original draft agreement indicat-
    ing that the agreement was supported by consideration
    because, as the plaintiff testified at trial, ‘‘no new prom-
    ises, undertakings, or consideration [was] exchanged
    in connection with the revocation . . . agreement.’’ At
    about this same time, the defendant, who previously
    had not been represented during mediation, tried to
    contact attorney Wayne Effron, who had represented
    him in connection with the parties’ postnuptial agree-
    ment, but Effron did not respond to the defendant’s
    attempts to reach him. Nevertheless, on January 18,
    2014, the parties duly executed the revocation agree-
    ment.5
    According to the defendant, he signed the agreement
    because he understood that all documents and agree-
    ments created during the mediation process would
    remain confidential and were to be used solely by the
    parties for the purpose of obtaining a complete settle-
    ment agreement, that is, an agreement that resolved all
    of the disputed issues. Consistent with this understand-
    ing, he further understood that, because ‘‘mediation is
    an all or nothing process,’’ any document that he signed
    would have no legal effect unless and until the media-
    tion process resulted in the parties’ reaching such a
    complete agreement. The defendant’s understandings
    regarding the agreement were based on the representa-
    tions set forth on Segall’s website concerning the right
    of either party to terminate mediation at any time with-
    out sacrificing any of his or her preexisting rights, Seg-
    all’s December 20, 2013 e-mail to the parties indicating
    that revocation of the postnuptial agreement was not
    necessary because it effectively would be superseded
    by any mediated settlement between the parties, and
    paragraph 4 (a) of the mediation agreement itself, which
    provides that all documents prepared or presented dur-
    ing mediation were to remain confidential for all pur-
    poses, including judicial proceedings.6
    During mediation, Segall also prepared a proposed
    parenting plan for the parties, informing them that, as
    with the revocation agreement, this plan would be used
    solely in an effort to obtain a complete settlement agree-
    ment and would not become effective unless ratified
    by the court. On February 26, 2014, the parties signed
    the proposed parenting plan, which, with the consent
    of both parties, subsequently was filed with the court
    so as to meet a case management deadline that had
    been set in their pending dissolution action. The court,
    however, never canvassed the parties with respect to
    the agreement; nor was the plan ever incorporated into
    any order of the court. In July, 2014, mediation ended
    without the parties reaching a settlement agreement. On
    September 4, 2014, following the defendant’s decision
    to move out of the marital home, where both parties
    had been residing, the defendant filed a motion to mod-
    ify the proposed parenting plan, requesting that the
    parties be given joint physical and legal custody of their
    minor children. The court, however, never ruled on
    that motion.
    A dissolution trial was conducted over a period of
    eighteen days in October, November, and December,
    2016, during which the trial court heard extensive testi-
    mony from several witnesses, including each of the
    parties; Harry Adamakos, a court-appointed psycholo-
    gist who performed a forensic custody evaluation;
    Attorney Bonnie L. Amendola, the guardian ad litem
    for the parties’ minor children; Bryan J. Matthews, a
    friend of the plaintiff; and Kane Winn, a private investi-
    gator retained by the defendant. On January 3, 2017,
    the trial court issued a memorandum of decision in
    which it found that the parties’ marriage had broken
    down irretrievably, with more fault attributable to the
    plaintiff, and entered a decree dissolving the marriage.
    The court awarded the parties joint legal and physical
    custody of their minor children with the defendant hav-
    ing final decision-making authority. The court explained
    its reasons for awarding final decision-making authority
    to the defendant as follows: ‘‘Individually, both the
    plaintiff and the defendant are good parents. However,
    the defendant has more insight into the children’s devel-
    opmental needs, activities, education and environment.
    He has been able to structure his work time to [have]
    additional time off for the children on Wednesdays,
    Thursdays and Fridays. The plaintiff, on the other hand,
    is deceptive, defensive, rigid, impulsive, manipulative,
    and lacks objectivity regarding the defendant. The plain-
    tiff is controlling and authoritative in parental situations
    that involve the defendant. The defendant has been
    marginalized from his children’s lives and, as such, does
    not trust the plaintiff. The plaintiff has belittled the
    defendant’s family and told the defendant that his job
    has no value, that he is merely a ‘Wall Street guy chasing
    dollars.’ The plaintiff lied to the guardian ad litem and
    the forensic evaluator about her personal life and has,
    thus, forced the children into ‘secret keeping’ from the
    defendant. There has been little to no coparenting
    between them; instead, the plaintiff unilaterally sched-
    ules the children’s activities and social events, and only
    tells the defendant about them after they have been
    scheduled or have occurred.’’
    With respect to the parties’ revocation agreement,
    the trial court acknowledged that ‘‘there is scant Con-
    necticut legal authority [concerning] the requirements
    for an effective revocation of a postnuptial agreement.’’
    Given the dearth of such authority, the trial court sub-
    jected the agreement to the same special scrutiny that
    courts apply in determining the enforceability of a post-
    nuptial agreement. Under that standard, which was first
    articulated by this court in Bedrick v. Bedrick, 
    300 Conn. 691
    , 
    17 A.3d 17
     (2011), a postnuptial agreement is
    enforceable ‘‘only if it complies with applicable contract
    principles, and the terms of the agreement are both
    fair and equitable at the time of execution and not
    unconscionable at the time of dissolution.’’ (Footnote
    omitted.) 
    Id.,
     703–704. ‘‘[T]he terms of a postnuptial
    agreement are fair and equitable at the time of execution
    if the agreement is made voluntarily, and without any
    undue influence, fraud, coercion, duress or similar
    defect. Moreover, each spouse must be given full, fair
    and reasonable disclosure of the amount, character and
    value of property, both jointly and separately held, and
    all of the financial obligations and income of the other
    spouse. . . . [I]n determining whether a particular
    postnuptial agreement is fair and equitable at the time
    of execution, a court should consider the totality of
    the circumstances surrounding execution. A court may
    consider various factors including the nature and com-
    plexity of the agreement’s terms, the extent of and dis-
    parity in assets brought to the marriage by each spouse,
    the parties’ respective age, sophistication, education,
    employment, experience, prior marriages, or other
    traits potentially affecting the ability to read and under-
    stand an agreement’s provisions, and the amount of
    time available to each spouse to reflect [on] the agree-
    ment after first seeing its specific terms . . . [and]
    access to independent counsel prior to consenting to
    the contract terms. . . .
    ‘‘With regard to . . . whether a postnuptial agree-
    ment is unconscionable at the time of dissolution, [that]
    . . . determination . . . is to be made on a case-by-
    case basis, taking into account all of the relevant facts
    and circumstances.’’ (Citations omitted; footnote omit-
    ted; internal quotation marks omitted.) 
    Id.,
     704–705.
    ‘‘[T]he question of whether enforcement of an agree-
    ment would be unconscionable is analogous to
    determining whether enforcement of an agreement
    would work an injustice.’’7 
    Id., 706
    .
    Applying this standard to the parties’ revocation
    agreement, the trial court found, inter alia, that, ‘‘prior to
    signing the document, the parties revealed their entire
    personal and joint assets and liabilities to one another,
    and provided the other with a full, complete and current
    financial affidavit. Both parties signed the agreement.’’
    The trial court also found, however, that, ‘‘[c]ontrary
    to the terms of the alleged revocation, and unlike the
    circumstances surrounding the negotiation and signing
    of the postnuptial agreement . . . the defendant had
    no legal counsel at the time he signed the revocation.
    The defendant was told by the mediator [Segall] to sign
    the alleged revocation document only six days after it
    was broached to him, and he informed [Segall] that he
    was unable to contact his attorney during that time
    period. . . . Consequently, the defendant . . . was
    never advised that the plaintiff might seek to enforce
    [the revocation agreement], and, arguably, the effect of
    arguing that he was coerced into signing it or, in the
    alternative, signed it under duress.’’
    In addition to its finding that the defendant did not
    have the requisite access to counsel, the trial court
    determined that the revocation agreement was unen-
    forceable as a matter of law because ‘‘the defendant
    relied on paragraph 4 (a) of the parties’ mediation agree-
    ment, as well as correspondence from [Segall] . . .
    that all written materials prepared during the mediation,
    presumably including the alleged revocation of the post-
    nuptial agreement, would remain confidential and were
    to be used solely in an effort to obtain a complete
    settlement of all terms, which never occurred. In addi-
    tion to the alleged revocation agreement, a proposed
    parenting plan . . . was also [drafted] and utilized
    solely in that regard, although it was never approved
    by the court.’’ (Citations omitted.) The court also found
    that the defendant had relied on ‘‘the wording on [Seg-
    all’s] website . . . that he . . . could withdraw from
    the mediation at any time without sacrificing any of his
    rights, including those previously negotiated, drafted
    and included in the postnuptial agreement. As such,
    [Segall] misrepresented the efficacy and use of the pur-
    ported revocation agreement.’’ (Citation omitted.)
    Because of its conclusion that the revocation agree-
    ment was unenforceable, the trial court also was
    required to determine the enforceability of the parties’
    postnuptial agreement. With the exception of one provi-
    sion that the trial court found to be severable,8 the
    court concluded that that postnuptial agreement was
    enforceable. Before doing so, the trial court identified
    all of the criteria, as spelled out in Bedrick, that must
    be met before a postnuptial agreement may be found
    to be enforceable, including the requirements that the
    agreement was fair and equitable at the time of execu-
    tion and not unconscionable at the time of dissolution.
    The trial court then found that, ‘‘prior to finalizing the
    [postnuptial agreement], the parties revealed their
    entire personal and joint assets and liabilities to one
    another, and each provided the other with a full, com-
    plete and current financial affidavit. In addition, both
    parties had independent legal counsel during the negoti-
    ation, pendency and execution of the agreement. Both
    parties signed the agreement, and both signatures were
    witnessed by two independent parties. Both parties
    . . . have doctoral, anticipated masters, and under-
    graduate college degrees, and, as such, understood their
    rights and obligations under the terms of the [postnup-
    tial agreement]. There is no evidence of undue influ-
    ence, fraud, coercion, duress or similar defect concern-
    ing the execution of the [postnuptial agreement].’’
    In light of these findings, the trial court ordered the
    defendant to pay alimony to the plaintiff in the amount
    of $350,000 per year, or $29,167 per month, in accor-
    dance with the terms of the postnuptial agreement. The
    trial court further ordered that ‘‘[t]he defendant . . .
    pay child support to the plaintiff in the amount of $676
    per week, in accordance with the state . . . child sup-
    port guidelines.’’ The trial court also ordered the defen-
    dant to ‘‘pay the reasonable costs of each child’s private
    day school tuition and books’’ and ‘‘90 percent . . . of
    the cost of any and all uninsured and/or unreimbursed
    medical [expenses] for each of the parties’ two minor
    children.’’ Finally, in accordance with the parties’ post-
    nuptial agreement, the court awarded the plaintiff
    $1,326,849, which represented one third of the parties’
    aggregate net worth as defined by the agreement.
    On February 8, 2017, the court amended the child
    support orders, explaining that, although the presump-
    tive minimum child support amount is $708 per week
    and the presumptive order under the child support
    guidelines would require the defendant to pay 100 per-
    cent of the children’s unreimbursed medical expenses,
    there are three valid deviation criteria applicable in this
    case. The court identified these criteria as follows: (1)
    ‘‘the plaintiff’s earnings capacity is an annual, pretax
    amount of $77,500’’; (2) ‘‘the order of shared physical
    custody’’; and (3) ‘‘the defendant’s private school educa-
    tion obligations to the minor children.’’
    On appeal,9 the plaintiff claims that the trial court
    incorrectly concluded that the parties’ purported agree-
    ment to revoke the postnuptial agreement was unen-
    forceable and that their postnuptial agreement was
    enforceable. The plaintiff also claims that the trial court
    incorrectly awarded the parties joint legal and physical
    custody of their minor children with the defendant hav-
    ing final decision-making authority. We reject each of
    these contentions, which we discuss in turn.10
    I
    We first address the plaintiff’s contention that the trial
    court incorrectly concluded that the parties’ written
    agreement purporting to revoke their postnuptial agree-
    ment was unenforceable. The plaintiff asserts that the
    trial court’s heightened scrutiny of that agreement was
    unwarranted because, unlike a postnuptial agreement,
    which removes the issues of alimony and property divi-
    sion from the court’s purview, the revocation of a post-
    nuptial agreement returns those issues to the court for
    adjudication, thereby placing the parties ‘‘on equal foot-
    ing’’ in any future dissolution action. The plaintiff fur-
    ther claims that, even if the revocation agreement was
    properly the subject of special scrutiny, the record does
    not support the trial court’s refusal to enforce it for the
    reasons articulated by the court, namely, because the
    defendant did not have access to an attorney prior to
    its execution and because the defendant was led to
    believe, and did believe, that the revocation agreement
    was not binding on the parties if they were unable
    to reach a mediated settlement of their dispute. The
    plaintiff finally argues that, even if the trial court’s find-
    ings are supported by the record, the court incorrectly
    relied on parol evidence to ascertain the import of the
    parties’ revocation agreement. The defendant, for his
    part, maintains that the trial court properly applied spe-
    cial scrutiny to the parties’ agreement but that, even
    without such scrutiny, the trial court’s refusal to enforce
    the agreement is supported by ordinary contract princi-
    ples. We agree with the defendant that the trial court’s
    decision is sustainable under established contract law.
    As the trial court observed in its memorandum of
    decision, there is no case law in this state—or, to our
    knowledge, in any other jurisdiction— identifying the
    legal standard by which the validity of an agreement
    purporting to revoke a postnuptial agreement is to be
    evaluated. This dearth of authority is undoubtedly due
    to the fact that, unlike premarital agreements, which
    are common, postnuptial agreements are not. Rarer still
    are agreements between spouses purporting to revoke
    a postnuptial agreement. For purposes of the present
    case, however, it is unnecessary for us to decide
    whether an agreement to revoke a postnuptial agree-
    ment should be subject to the same heightened scrutiny
    as the postnuptial agreement itself. We need not do so
    in light of the fact that the trial court’s finding that
    the defendant signed the revocation agreement only
    because he reasonably understood that it would not
    be binding unless the parties reached a full and final
    settlement of the disputed issues constitutes a valid
    basis for sustaining that court’s judgment under ordi-
    nary contract principles.
    As we previously discussed, the trial court found
    that the defendant signed the revocation agreement in
    reliance on the representations on Segall’s website con-
    cerning the purpose and scope of mediation, statements
    contained in Segall’s December 20, 2013 e-mail to the
    parties, and the provisions of paragraph 4 (a) of the
    parties’ mediation agreement. As the trial court
    explained, these materials together permitted the defen-
    dant to withdraw from the mediation at any time with-
    out sacrificing any of his rights, including his rights
    under the parties’ 2012 postnuptial agreement, and they
    further provided that all writings prepared during the
    mediation, including the parties’ revocation agreement,
    were confidential and for use solely and exclusively to
    facilitate a complete settlement of their pending case,
    which, of course, never occurred. Thus, the defendant’s
    purported understanding that he could terminate the
    mediation at any time, and that, if he did, the revocation
    agreement would not be enforceable, was fully sup-
    ported by the representations on Segall’s website, in
    the December 20, 2013 e-mail, and in the mediation
    agreement. The trial court’s finding that the defendant
    did, in fact, rely on these representations is itself amply
    supported by the defendant’s testimony.
    As we also noted previously, the trial court couched
    its findings in terms of misrepresentation. More specifi-
    cally, the court stated that Segall had ‘‘misrepresented
    the efficacy and use of the purported revocation agree-
    ment,’’ evidently because Segall failed to clarify that,
    despite the aforementioned representations to the con-
    trary, the revocation agreement was binding on the
    parties even if they ultimately were unsuccessful in
    reaching a mediated settlement of their case. We are
    not persuaded, however, that principles of misrepresen-
    tation provide the proper lens through which to view the
    trial court’s underlying factual findings. It is apparent,
    rather, that, in light of the representations on which
    the plaintiff relied in entering into the revocation agree-
    ment, the agreement was not enforceable unless the
    parties successfully mediated the disputed issues. Put
    differently—in terms well established in contract law—
    a full and final resolution of those issues was a condition
    precedent to the enforceability of the revocation agree-
    ment. See, e.g., Southport Congregational Church—
    United Church of Christ v. Hadley, 
    320 Conn. 103
    , 113,
    
    128 A.3d 478
     (2016) (‘‘[a] condition precedent is a fact
    or event [that] the parties intend must exist or take
    place before there is a right to performance’’ (internal
    quotation marks omitted)); Blumberg Associates
    Worldwide, Inc. v. Brown & Brown of Connecticut,
    Inc., 
    311 Conn. 123
    , 180–81 n.50, 
    84 A.3d 840
     (2014)
    (‘‘conditions precedent to the formation of a contract
    involve issues of offer and acceptance [that] precede
    and determine the formation of a contract’’ (internal
    quotation marks omitted)); Luttinger v. Rosen, 
    164 Conn. 45
    , 48, 
    316 A.2d 757
     (1972) (‘‘[i]f the condition
    precedent is not fulfilled the contract is not enforce-
    able’’); McIsaac v. Hale, 
    104 Conn. 374
    , 379, 
    132 A. 916
    (1926) (‘‘[a] condition precedent is one [that] must be
    performed before the agreement of the parties becomes
    a valid and binding contract’’). Moreover, in determining
    whether performance of the revocation agreement was
    predicated on the occurrence of a condition precedent,
    namely, the parties’ successful mediation of their dis-
    pute, the trial court was free to credit the defendant’s
    testimony. See, e.g., Bender v. Bender, 
    292 Conn. 696
    ,
    729, 
    975 A.2d 636
     (2009) (‘‘[t]o the extent that there
    was conflicting testimony as to whether the parties
    . . . had agreed to . . . a condition precedent to the
    agreement becoming a valid contract, the trial court
    was entitled to credit the testimony of the plaintiffs
    over that of the defendants concerning that matter’’).
    Because the evidence supports the trial court’s conclu-
    sion that the enforceability of the revocation agreement
    was conditioned on the parties reaching a successful
    resolution of the case, and because it is undisputed that
    no such resolution was ever reached, the court correctly
    determined that the revocation agreement was not
    enforceable against the defendant over his objection.
    The plaintiff challenges the trial court’s determina-
    tion that the revocation agreement was not enforceable
    on two grounds. First, she contends that the trial court’s
    reliance on the representations on Segall’s website, in
    Segall’s December 20, 2013 e-mail to the parties and in
    the mediation agreement for the purpose of ascertaining
    the defendant’s understanding and intent with respect
    to the revocation agreement violates the parol evidence
    rule. The plaintiff further argues that the trial court’s
    determination regarding the defendant’s understanding
    that the revocation agreement was not binding if the
    parties did not reach a final settlement agreement is
    not supported by the evidence. We disagree with
    both claims.
    With respect to the plaintiff’s first contention, it is
    well established that ‘‘the parol evidence rule is not a
    rule of evidence, but a substantive rule of contract law’’
    that bars the use of extrinsic evidence to vary the terms
    of an otherwise plain and unambiguous contract. (Inter-
    nal quotation marks omitted.) Heyman Associates No.
    1 v. Ins. Co. of Pennsylvania, 
    231 Conn. 756
    , 779–80,
    
    653 A.2d 122
     (1995). The rule does not prohibit the use
    of extrinsic evidence for other purposes, however, such
    as to prove mistake, fraud or misrepresentation in the
    inducement of the contract. See, e.g., Sims v. Honda
    Motor Co., 
    225 Conn. 401
    , 416, 
    623 A.2d 995
     (1993)
    (‘‘[t]he parol evidence rule . . . is not absolute . . .
    but admits of various exceptions, some of which are
    based on equitable considerations’’); Paiva v. Vanech
    Heights Construction Co., 
    159 Conn. 512
    , 521, 
    271 A.2d 69
     (1970) (‘‘[t]he parol evidence rule has no application
    [when] there has been fraud in the inducement of the
    contract, and parol evidence is ordinarily admissible
    to prove fraudulent misrepresentations’’); Warman v.
    Delaney, 
    148 Conn. 469
    , 474, 
    172 A.2d 188
     (1961) (parol
    evidence was properly admitted because proponent of
    such evidence was ‘‘not seeking to add to, subtract from
    or alter the terms of the written contract itself’’ but,
    rather, was seeking to establish ‘‘material misrepresen-
    tation in the inducement of the contract’’).
    The rule also does not prevent a party from using
    extrinsic evidence to establish the existence of a condi-
    tion precedent to the formation of a contract. See, e.g.,
    Cohn v. Dunn, 
    111 Conn. 342
    , 346, 
    149 A. 851
     (1930)
    (‘‘[a] collateral agreement that the writing is not to take
    effect until the happening of some other event . . .
    may . . . be proved by parol [evidence]’’). As we
    explained long ago, ‘‘[t]he rule . . . is, that [one] may
    show that a writing purporting to be a contract never
    came into existence as a contract, or has ceased to be
    a contract, and [this] may [be] show[n] . . . by evi-
    dence outside of the writing. This . . . rule is not an
    exception to the [parol evidence rule or] an infringe-
    ment of it.’’ Burns & Smith Lumber Co. v. Doyle, 
    71 Conn. 742
    , 745, 
    43 A. 483
     (1899). ‘‘The practical distinc-
    tion between the two rules . . . is that evidence to
    vary the terms of an agreement in writing is not admissi-
    ble, but evidence to show that there is not an agreement
    at all is admissible.’’ (Citation omitted; internal quota-
    tion marks omitted.) 
    Id.,
     745–46. Accordingly, the trial
    court correctly considered parol evidence to evaluate
    the defendant’s claim that the revocation agreement
    was not binding in the absence of a final settlement
    agreement.11
    Nor do we agree with the plaintiff that the trial court’s
    interpretation of that evidence and its finding that the
    defendant relied on it were incorrect as a matter of
    law. As we previously explained, Segall’s website char-
    acterized mediation as ‘‘entirely voluntary’’; (emphasis
    omitted); and stated further that either party ‘‘can leave
    mediation at any time, without sacrificing any of [his
    or her] rights.’’ (Emphasis added.) In his December 20,
    2013 e-mail to the parties, Segall stated that, even
    though he could and would draft a revocation agree-
    ment at the parties’ request, such an agreement was
    not necessary because the parties’ mediated resolution
    of the case would ‘‘effectively override’’ the postnuptial
    agreement. Although this statement is explicit as to why
    a revocation agreement would be unnecessary if the
    parties were to reach a mediated settlement of their
    case, Segall’s failure to explain that such an agreement
    would have materially affected the parties’ financial
    relationship in the event that they failed to resolve the
    case strongly suggests that Segall himself understood
    that the agreement also would not be binding if the
    parties did not reach a settlement. Finally, the mediation
    agreement expressly provided that the parties could
    terminate mediation ‘‘at any time’’ and that both sides
    ‘‘agree to keep confidential all statements made during
    the mediation, as well as all written, photographic, elec-
    tronic or printed material and documents prepared . . .
    during the mediation . . . . This agreement regarding
    confidentiality shall pertain to all circumstances,
    including but not limited to any civil and criminal
    proceedings.’’ (Emphasis added.) The plaintiff’s con-
    tention to the contrary notwithstanding, we agree with
    the trial court’s interpretation of this evidence as enti-
    tling the defendant, irrespective of the existence of the
    revocation agreement, to walk away from mediation at
    any time without sacrificing any of his rights under the
    postnuptial agreement.12 Furthermore, as we previously
    indicated, the trial court had every right to credit the
    defendant’s testimony that he understood and relied
    on these representations in deciding to enter into the
    revocation agreement. Accordingly, we agree with the
    defendant that the revocation agreement was unen-
    forceable once he elected to terminate mediation with-
    out reaching a resolution of the parties’ dispute.13
    II
    We next address the plaintiff’s claim that the trial
    court incorrectly determined that the parties’ postnup-
    tial agreement was enforceable because it was fair and
    equitable at the time of execution and not unconsciona-
    ble at the time of dissolution, as required by Bedrick.
    In support of her contention, the plaintiff maintains,
    contrary to the determination of the trial court, that
    the agreement was not fair and equitable at the time
    of execution, primarily because (1) she signed it under
    duress, after the defendant threatened to divorce her
    if she refused to do so, and (2) the agreement’s terms are
    both complex and prolix. The plaintiff further contends
    that enforcement of the agreement would be unconscio-
    nable because the share of the marital estate allocated
    to the defendant under the agreement is ‘‘grossly dispro-
    portionate’’ to what the plaintiff otherwise would be
    awarded. We are not persuaded by these claims.14
    As we previously indicated, the trial court, in conclud-
    ing that the postnuptial agreement was fair and equita-
    ble, expressly found that there was no ‘‘undue influence,
    fraud, coercion, duress or similar defect’’ concerning
    the execution of the agreement. The plaintiff disputes
    this finding, arguing that it is unsupported in light of
    what she characterizes as her uncontradicted testimony
    that she signed the postnuptial agreement under duress.
    Even if we were to agree with the plaintiff that the
    defendant failed to adduce evidence directly contradict-
    ing her testimony in this regard, the trial court was not
    bound to accept that testimony as true. As this court
    previously has explained, ‘‘[i]n evaluating [uncontra-
    dicted] testimony, the trial court must assess the credi-
    bility of the testifying witness and consider the presence
    or absence of corroborating evidence. Since the trial
    court as the finder of fact is uniquely competent to
    determine the credibility and weight to be accorded to
    evidence, the scope of our review of the trial court’s
    decision to accept or reject the [witness’] uncontra-
    dicted testimony is limited. After considering the total-
    ity of the record in the light most favorable to sustaining
    the trial court’s factual conclusions, we will disturb the
    trial court’s findings only if we determine that they are
    clearly erroneous.’’ Bieluch v. Bieluch, 
    199 Conn. 550
    ,
    555–56, 
    509 A.2d 8
     (1986). The plaintiff has failed to
    make such a showing. Because the trial court was able
    to assess the plaintiff’s credibility firsthand—and
    expressly found her credibility to be lacking—we have
    no reason to question the trial court’s finding that,
    despite her testimony to the contrary, the plaintiff
    entered into the agreement voluntarily.
    It bears emphasis, moreover, that the plaintiff’s testi-
    mony claiming duress did not go unchallenged by the
    defendant. For example, article XVIII of the postnuptial
    agreement expressly provides that ‘‘[t]he [plaintiff]
    acknowledges that she has carefully read this [a]gree-
    ment, that she has given due consideration to the
    [a]greement and that [the] [a]greement is in all respects
    fair and equitable, that it is being entered into volunta-
    rily, and that it is not the result of any duress or undue
    influence exercised by either party on the other. . . .
    The [plaintiff] further acknowledges that this [a]gree-
    ment was prepared at her instigation and signed as a
    result of her insistence.’’ Considering the entirety of
    the evidence, the trial court reasonably concluded that
    the plaintiff’s decision to enter into the postnuptial
    agreement was voluntary and not the product of duress.
    We also reject the plaintiff’s contention that the agree-
    ment was unfair and inequitable at the time of execution
    because it is complicated and spans thirty-five pages.
    Although the length and complexity of a postnuptial
    agreement comprise one of many factors courts may
    consider in evaluating the enforceability of such an
    agreement; Bedrick v. Bedrick, 
    supra,
     
    300 Conn. 705
    ;
    that factor is relevant only insofar as it bears on the
    question of whether the parties understood the agree-
    ment’s terms at the time of execution. In the present
    case, the evidence fully supports the trial court’s finding
    that the plaintiff understood her rights and obligations
    under the agreement notwithstanding its length and
    complexity. The plaintiff, like the defendant, is highly
    educated, and holds a PhD in mechanical and nuclear
    engineering from the University of California, Berkeley.
    In addition, the plaintiff had independent legal counsel
    to advise her during the negotiation and execution of
    the postnuptial agreement. Finally, the agreement itself
    provides that ‘‘[t]his [a]greement was drafted coopera-
    tively by the parties’ counsel (in consultation with the
    parties)’’ and that ‘‘both [parties] and their respective
    counsel have had a full and fair opportunity to negotiate
    and review the terms [of the agreement] and to contrib-
    ute to the substance and form of this [a]greement.’’
    Finally, the agreement provides that ‘‘[b]oth parties
    hereby jointly and severally acknowledge their com-
    plete understanding of [the] legal and other effects of
    this [a]greement.’’ The plaintiff has provided no expla-
    nation as to why, in light of these facts, the trial court’s
    finding should be disturbed, and we are aware of none.
    We also disagree with the plaintiff that the trial court
    incorrectly determined that the postnuptial agreement
    was not unconscionable at the time of dissolution. The
    plaintiff’s claim of unconscionability is predicated on
    the fact that the postnuptial agreement excluded from
    the definition of ‘‘joint property’’ any interest the parties
    had ‘‘in any deferred, defined contribution, defined ben-
    efit or other pension, retirement or profit sharing plan,’’
    as well as certain other employment related assets that
    had not yet vested and/or were subject to forfeiture or
    clawback.15 The plaintiff contends that, if these assets
    had been included as joint property under the agree-
    ment, her share of the marital estate would have been
    substantially more than $1,326,849, the amount she ulti-
    mately was awarded. As we have explained, however,
    ‘‘[u]nfairness or inequality alone does not render a post-
    nuptial agreement unconscionable; spouses may agree
    on an unequal distribution of assets at dissolution. [T]he
    mere fact that hindsight may indicate [that] the provi-
    sions of the agreement were improvident does not ren-
    der the agreement unconscionable. . . . Instead, the
    question of whether enforcement of an agreement
    would be unconscionable is analogous to determining
    whether enforcement of an agreement would work an
    injustice. . . . Marriage, by its very nature, is subject
    to unforeseeable developments, and no agreement can
    possibly anticipate all future events. Unforeseen
    changes in the relationship, such as having a child, loss
    of employment or moving to another state, may render
    enforcement of the agreement unconscionable.’’ (Cita-
    tions omitted; internal quotation marks omitted.)
    Bedrick v. Bedrick, 
    supra,
     
    300 Conn. 705
    –706. The plain-
    tiff, however, has not identified a single change of cir-
    cumstance—in her life, in the defendant’s life or in the
    lives of their children—that would warrant the conclu-
    sion that enforcement of the parties’ postnuptial agree-
    ment would be unconscionable. But cf. id., 707 (enforce-
    ment of postnuptial agreement was unconscionable
    because economic circumstances of parties had
    changed dramatically since execution of agreement
    eighteen years earlier). We therefore conclude that the
    trial court correctly determined that the postnuptial
    agreement was not unconscionable at the time of disso-
    lution.
    III
    The plaintiff finally claims that the trial court improp-
    erly based its custody orders on the testimony of
    Amendola, the guardian ad litem for the parties’ chil-
    dren. The plaintiff contends that the trial court should
    not have considered Amendola’s testimony in determin-
    ing the best interests of the children because, at trial,
    Amendola stated that she had not seen the children in
    two years. The defendant responds that it is clear from
    the record that the trial court based its custody orders
    on a careful evaluation of the all of the evidence and
    in consideration of the various relevant factors set forth
    in General Statutes § 46b-56 (c).16 The defendant further
    contends that there is nothing in the record to indicate
    that the trial court based its custody orders on Amendo-
    la’s testimony but that, even if it did, it was well within
    the court’s discretion to do so. We agree with the
    defendant.
    The following additional facts are relevant to our
    resolution of this claim. In September, 2014, the court
    appointed Amendola as guardian ad litem for the par-
    ties’ children, who were eight and six years old at the
    time. Amendola met with the children only once, shortly
    after her appointment. At trial two years later, she rec-
    ommended that the parties share joint legal and physical
    custody of the children with the defendant having final
    decision-making authority. Amendola’s recommenda-
    tion was founded on her frequent and ongoing phone
    and e-mail correspondence with the parties; her review
    of the relevant pleadings, court transcripts, and corre-
    spondence between the parties; her attendance at depo-
    sitions and court proceedings; her conversations with
    and review of reports prepared by Adamakos, the court-
    appointed psychologist who performed the forensic
    custody evaluation; and information obtained from the
    children’s schools. Amendola further testified that,
    although she was in frequent contact with the plaintiff
    and the defendant, she chose to meet with the children
    themselves only once due to their tender years and to
    keep them as far removed from their parents’ marital
    conflicts as possible. Amendola explained that she
    relied on Adamakos to keep her apprised of the chil-
    dren’s progress rather than meet with them directly.
    The record reveals that Adamakos met with each of
    the children individually for a period of one hour on
    November 25, 2015, December 9, 2015, June 6, 2016,
    and June 23, 2016. He also conducted home visits during
    which he observed the children’s interaction with their
    parents. On the basis of these visits and observations,
    Adamakos prepared two custody evaluation reports,
    dated January 10, 2016, and July 25, 2016, respectively,
    which were entered into evidence at trial. In his reports,
    Adamakos described the children as extremely well-
    adjusted and noted that they appeared to enjoy an
    equally close and loving relationship with each of
    their parents.
    At trial, Adamakos recommended that the parties
    share joint legal custody and that the children primarily
    reside with the plaintiff and spend alternating weekends
    from Thursday evening to Sunday evening with the
    defendant, as well as Thursday after school until Friday
    morning during weeks that the children would not be
    spending the upcoming weekend with the defendant.
    He also recommended that the parents engage the ser-
    vices of a coparent coordinator ‘‘to help [them] make
    decisions [and] break a deadlock, if you will . . . .’’
    When asked whether he was aware that the defendant
    had arranged with his employer to adjust his work
    schedule so he could be more available for the children,
    Adamakos testified that, ‘‘if [the defendant is] more
    available, he’s certainly a capable parent, and children
    benefit from both parents, so I would think that maybe
    more time than I recommended would be appropriate.’’
    With respect to the parties’ ability to coparent, Ada-
    makos agreed with Amendola’s assessment that ‘‘it’s
    difficult for the plaintiff to consider [the defendant’s]
    perspective’’ and ‘‘that anger and resentment have com-
    promised [the plaintiff’s] ability to empathize with [the
    defendant]’’ in matters pertaining to the children. Ada-
    makos further testified that the plaintiff, whom he
    described as ‘‘controlling’’ and ‘‘rigid,’’ ‘‘does not want
    to have to negotiate with the defendant over anything
    that has to do with parenting,’’ that she has ‘‘egocentric
    qualities about how she makes decisions,’’ which have
    ‘‘marginalized’’ the defendant, that there are times
    ‘‘when the plaintiff . . . intentionally interferes with
    [the defendant’s] time with the children,’’ that the plain-
    tiff ‘‘sees herself as the authority with respect to the
    children,’’ and that the plaintiff ‘‘is blind . . . to under-
    standing the downside, the negative consequences of
    [her behavior] . . . .’’
    On the basis of this and other testimony, the trial
    court awarded the parties joint legal and physical cus-
    tody of their children, with the defendant having final
    decision-making authority. In support of its decision,
    the court found, among other things, that, although both
    the plaintiff and the defendant are good parents, the
    defendant has ‘‘more insight into the children’s develop-
    mental needs, activities, education and environment,’’
    and has structured his work schedule so that he has
    additional time off to be with the children during the
    week.
    ‘‘This court has consistently held in matters involving
    child custody . . . that while the rights, wishes and
    desires of the parents must be considered it is neverthe-
    less the ultimate welfare of the child [that] must control
    the decision of the court. . . . In making this determi-
    nation, the trial court is vested with broad discretion
    which can . . . be interfered with [only] upon a clear
    showing that that discretion was abused.’’ (Citations
    omitted; internal quotation marks omitted.) Ridgeway
    v. Ridgeway, 
    180 Conn. 533
    , 541, 
    429 A.2d 801
     (1980).
    Thus, a trial court’s decision regarding child custody
    ‘‘must be allowed to stand if it is reasonably supported
    by the relevant subordinate facts found and does not
    violate law, logic or reason.’’ (Internal quotation marks
    omitted.) Gallo v. Gallo, 
    184 Conn. 36
    , 44, 
    440 A.2d 782
    (1981). Under § 46b-56 (c), the court, in determining
    custody, must consider the best interests of the child
    and, in doing so, may consider, among other factors,
    one or more of the sixteen factors enumerated in the
    provision.
    ‘‘[T]he authority to exercise the judicial discretion
    [authorized by § 46b-56] . . . is not conferred [on] this
    court, but [on] the trial court, and . . . we are not
    privileged to usurp that authority or to substitute our-
    selves for the trial court. . . . A mere difference of
    opinion or judgment cannot justify our intervention.
    Nothing short of a conviction that the action of the trial
    court is one [that] discloses a clear abuse of direction
    can warrant our interference.’’ (Internal quotation
    marks omitted.) Gallo v. Gallo, 
    supra,
     
    184 Conn. 44
    –45;
    see also Yontef v. Yontef, 
    185 Conn. 275
    , 279, 
    440 A.2d 899
     (1981) (‘‘[i]t is a rare case in which a disappointed
    litigant will be able to demonstrate abuse of a trial
    court’s broad discretion in [child custody] matters’’).
    The plaintiff’s sole contention with respect to the
    custody orders is that, ‘‘[b]ecause [Amendola] did not
    have frequent or recent contact with the children and
    because she did not do an investigation into the chil-
    dren’s best interest[s], the trial court should not have
    adopted her recommendations.’’ To be sure, Amendola
    had minimal personal contact with the children during
    the pendency of the dissolution action, which she appar-
    ently believed was in their best interests. There is noth-
    ing in the record to suggest, however, that she did
    not conduct an investigation into the children’s best
    interests. To the contrary, as we previously noted,
    Amendola testified that, from the time of her appoint-
    ment as guardian ad litem until the time of trial, she
    was in regular communication with the parties, she read
    Adamakos’ reports and consulted with him about his
    findings, and she attended all court proceedings and
    depositions. In light of the foregoing, the plaintiff’s
    assertion that Amendola conducted no investigation is
    without merit.
    The plaintiff contends, nonetheless, that it was
    improper for the trial court even to consider Amendola’s
    recommendations in light of her testimony that she had
    not seen the children in two years. We rejected a nearly
    identical claim in Blake v. Blake, 
    207 Conn. 217
    , 
    541 A.2d 1201
     (1988), and our reason for doing so is fully
    applicable to the present case. In Blake, the defendant,
    Benson P. Blake, claimed that the trial court, in deciding
    custody in that case, improperly had considered the
    expert opinions of the court-appointed custody evalua-
    tor and a family relations officer, whose views were
    based on information they had obtained between eight
    and sixteen months before the custody hearing. See 
    id., 224
    . In rejecting Blake’s claim, we acknowledged that
    a trial court, in making a custody determination, is
    bound to consider ‘‘the present best interests of the
    child at the time of the custody determination.’’
    (Emphasis in original; internal quotation marks omit-
    ted.) 
    Id.
     We explained, however, that ‘‘[t]he delay
    between [the witnesses’] examination of each child and
    their testimony at the custody hearing simply affects
    the weight of their testimony rather than its admissibil-
    ity.’’ 
    Id., 225
    . We further explained that the ‘‘standard
    of review in domestic relations cases is a very narrow
    one. We will not reverse a trial court’s rulings with
    regard to custody . . . unless the court incorrectly
    applied the law or could not reasonably have concluded
    as it did.’’ 
    Id.
     Finally, we observed that Blake ‘‘had a
    full opportunity at the custody hearing to point out any
    deficiencies concerning [the witnesses’] examination
    of the children, and ha[d] failed to demonstrate any
    substantial prejudice as a result of the delay between
    the time [they] interviewed each child and when cus-
    tody was determined.’’ 
    Id.
    As in Blake, the plaintiff in the present case had a
    full and fair opportunity to cross-examine Amendola
    about any possible deficiencies concerning the time she
    had spent with the children and how, if at all, any such
    deficiencies impaired her ability to form a legitimate
    opinion as to their best interests.17 The plaintiff has also
    failed to demonstrate that Amendola’s limited contact
    with the children prejudiced the plaintiff in any way.
    Indeed, Adamakos, who spent far more time with the
    children, largely agreed with Amendola’s recommenda-
    tions. Specifically, Adamakos agreed with Amendola
    that both of the parties were exceedingly capable and
    loving parents and should have joint legal custody of the
    children. Although he recommended that the children
    reside primarily with the plaintiff, it appears that that
    recommendation was based on his perception that the
    defendant’s work schedule prevented him from spend-
    ing as much time with the children as the plaintiff. When
    informed that the defendant had arranged with his
    employer to be more available to the children, Ada-
    makos responded that the defendant is ‘‘certainly a
    capable parent . . . so I would think that maybe more
    time than I recommended would be appropriate.’’
    Finally, Adamakos agreed with Amendola that the plain-
    tiff’s controlling nature and refusal to involve the defen-
    dant in decisions affecting the children were highly
    detrimental to the defendant’s relationship with the chil-
    dren. Whereas Amendola recommended that the defen-
    dant be given final decision-making authority over the
    children, Adamakos recommended that that authority
    be given to a court-appointed ‘‘coparent coordinator.’’
    Thus, in the end, the trial court’s custody determination
    came down to a determination of whether the plaintiff,
    the defendant, or a coparent coordinator should have
    final decision-making authority when the parties are
    unable to agree about the children. In light of the trial
    court’s finding that the defendant has more insight into
    ‘‘the children’s developmental needs, activities, educa-
    tion and environment,’’ it was hardly an abuse of discre-
    tion for the court to conclude that it was most appro-
    priate that the defendant be granted the right to exercise
    final decision-making authority.
    The judgment is affirmed.
    In this opinion the other justices concurred.
    1
    A postnuptial agreement is an agreement entered into during marriage,
    setting forth each spouse’s legal rights and obligations upon death or divorce.
    See, e.g., Bedrick v. Bedrick, 
    300 Conn. 691
    , 693 n.1, 
    17 A.3d 17
     (2011). The
    term ordinarily refers to an agreement between spouses at a time when
    they plan to remain married and neither separation nor divorce is imminent.
    See 
    id.
    2
    At the time of the parties’ trial in 2016, the plaintiff and the defendant
    were 40 and 38 years of age, respectively.
    3
    We note that, prior to trial, the defendant obtained an order closing the
    courtroom for certain testimony and sealing certain exhibits, records and
    documents offered into evidence at trial, including, inter alia, the terms and
    conditions of the defendant’s employment with Two Sigma Investments.
    The defendant’s base salary and any findings of fact with respect to the
    defendant’s income, however, were not covered by the order.
    4
    Paragraph 4.11 (a) of the parties’ postnuptial agreement defines ‘‘aggre-
    gate net worth’’ as the ‘‘value of the parties’ [j]oint [p]roperty . . . less (1)
    the aggregate amount of the separate liabilities of the [parties] . . . (2) the
    sum of all taxes of any kind [that] would be owing in the event of a hypotheti-
    cal immediate liquidation of all [j]oint [p]roperty as of the date of the
    [divorce] decree . . . (3) the sum of all taxes of any kind [that] would be
    owing in the event of a hypothetical immediate exercise of all vested stock
    options held by the parties or either of them, and the immediate sale of the
    resulting shares of stock as of the date of the [divorce] decree . . . and
    (4) the sum of all taxes of any kind [that] would be owing with respect to
    any vested [employment related] assets (other than options) held by the
    parties or either of them in the hypothetical event that said vested [employ-
    ment related] assets were fully taxable to the party in question as of the
    date of [t]he [divorce] [d]ecree.’’ (Emphasis in original.)
    5
    The revocation agreement provides in relevant part: ‘‘Each of the [plain-
    tiff] and the [defendant] declare[s] and acknowledge[s] that each has had
    independent counsel of his/her own selection. Each of the [plaintiff] and the
    [defendant] further declare[s] and acknowledge[s] that each was afforded
    a reasonable and ample opportunity to consult with his or her counsel prior
    to the execution of this [a]greement. The [plaintiff] has been represented
    by Attorney Andrew Nemiroff, and the [defendant] has been represented
    by Attorney Wayne Effron.’’ In fact, contrary to the terms of the agreement,
    Effron neither represented nor otherwise advised the defendant either with
    respect to the parties’ mediation agreement or with respect to the revoca-
    tion agreement.
    6
    It bears noting that, under the defendant’s view of the revocation, it was,
    in effect, legally superfluous because it would be unenforceable if the parties
    did not reach a mediated resolution of their case, and, if they did resolve
    the case, the parties’ settlement agreement would, as Segall observed in his
    December 20, 2013 e-mail to the parties, ‘‘effectively override’’ the revocation
    agreement. As we previously discussed, it is apparent that the defendant
    agreed to revoke the postnuptial agreement only because the plaintiff
    requested such a revocation and the defendant believed that accommodating
    the plaintiff in that regard might serve to promote an amicable resolution
    of their case.
    7
    The enforcement of postnuptial agreements is subject to heightened
    scrutiny because of the special nature of the marital relationship. As we
    have explained, ‘‘[t]he circumstances surrounding [postnuptial] agreements
    . . . are pregnant with the opportunity for one party to use the threat of
    dissolution to bargain themselves into positions of advantage.’’ (Internal
    quotation marks omitted.) Bedrick v. Bedrick, 
    supra,
     
    300 Conn. 701
    . More-
    over, ‘‘the spouses to a postnuptial agreement . . . in contracting with one
    another . . . are certainly less cautious than they would be with an ordinary
    contracting party. With lessened caution comes greater potential for one
    spouse to take advantage of the other.’’ Id., 703.
    8
    That provision, paragraph 4.9 (b) of the postnuptial agreement, provides
    that, if either party seeks to invalidate a part of the agreement or seeks to
    recover property or alimony in contravention of the agreement, that party
    shall pay all of the attorneys’ fees and costs incurred by the other party in
    defending his or her rights under the agreement. The trial court found the
    provision to be ‘‘unfair, inequitable and unconscionable’’ and, therefore,
    unenforceable because it sought ‘‘to add an onerous financial penalty to
    either party who contests the efficacy of the postnuptial agreement . . . .’’
    This conclusion of the trial court has not been challenged on appeal.
    9
    The plaintiff appealed to the Appellate Court, and we transferred the
    appeal to this court pursuant to General Statutes § 51-199 (c) and Practice
    Book § 65-1.
    10
    We note that the guardian ad litem has filed a brief in support of the
    position of the defendant seeking affirmance of the trial court’s order with
    respect to the issue of custody.
    11
    We note that the parol evidence rule did not bar consideration of extrin-
    sic evidence for the purpose of determining whether, as the trial court
    concluded, Segall had ‘‘misrepresented the efficacy and use’’ of the revoca-
    tion agreement by virtue of his failure to clarify that the representations on
    his website, in his December 20, 2013 e-mail and in the mediation agreement
    were not intended to create a condition precedent to the revocation agree-
    ment’s enforceability, ‘‘As a matter of common law, a party to a contract
    . . . may rescind that contract and avoid liability thereunder if that party’s
    consent to the contract was procured either by the other party’s fraudulent
    misrepresentations, or by the other party’s nonfraudulent material misrepre-
    sentations.’’ Munroe v. Great American Ins. Co., 
    234 Conn. 182
    , 188 n.4,
    
    661 A.2d 581
     (1995). Likewise, misrepresentations by one who is not a party
    to the contract may also render the contract voidable by the party misled
    by the misrepresentation. Specifically, ‘‘[i]f a party’s manifestation of assent
    is induced by either a fraudulent or a material misrepresentation by one
    who is not a party to the transaction upon which the recipient is justified
    in relying, the contract is voidable by the recipient, unless the other party
    to the transaction in good faith and without reason to know of the misrepre-
    sentation either gives value or relies materially on the transaction.’’ 1
    Restatement (Second), Contracts § 164 (2), p. 445 (1981); see also, e.g.,
    Kenda Corp. v. Pot O’Gold Money Leagues, Inc., 
    329 F.3d 216
    , 224 (1st Cir.
    2003) (‘‘[p]rinciples of contract law permit rescission of a contract even
    when the misrepresentations at issue were made by a [nonparty] to the
    contract’’). In the present case, there is no evidence that the plaintiff gave
    anything of value in exchange for the defendant’s agreement to revoke the
    postnuptial agreement. Indeed, the plaintiff herself testified that no new
    promises, undertakings or consideration was exchanged in connection with
    the agreement. There also is no evidence that the plaintiff materially changed
    her position in reliance on the agreement, which, by her own admission,
    did no more than purport to restore to the courts the authority to allocate and
    distribute the parties’ marital estate in the event of a divorce. Accordingly,
    the trial court’s decision would be sustainable even if we, like the trial court,
    were to treat the issue presented as sounding in misrepresentation rather
    than one involving a condition precedent.
    12
    The plaintiff also asserts that the trial court’s findings concerning the
    defendant’s understanding as to the unenforceability of the revocation agree-
    ment are clearly erroneous because, soon after mediation broke down, the
    defendant filed a motion to amend the proposed parenting agreement that
    Segall had drafted for the parties to file with the court in order to meet a
    case management deadline. The plaintiff argues that, if the defendant had
    truly believed that agreements reached during mediation were binding only
    if the parties reached a final settlement, ‘‘there would be no point in modi-
    fying the proposed parenting plan after the mediation concluded.’’ To the
    contrary, the defendant may have filed the motion to amend the proposed
    parenting plan simply to obtain a more suitable plan in light of the parties’
    changed circumstances, which included, among other things, the defendant’s
    decision to move out of the marital home following the termination of
    mediation and the plaintiff’s simultaneous decision to return to school as
    a full-time student. In any event, the trial court was not required to infer
    that the defendant believed that he was bound by the revocation agreement
    merely because he filed the motion to amend the proposed parenting plan.
    13
    Because we conclude that the trial court correctly determined that the
    revocation agreement was unenforceable in the absence of a final mediated
    settlement agreement, we need not address whether the trial court correctly
    concluded that the agreement was unenforceable for the additional reason
    that the defendant did not have access to an attorney prior to signing it.
    14
    We note, preliminarily, that ‘‘we generally review a trial court’s discre-
    tionary decision in a domestic relations case using the clearly erroneous
    standard of review . . . . [I]n the present case, [however] we must apply
    the legal standards described [herein], namely, whether the terms of the
    agreement were fair and equitable at the time of execution and not uncon-
    scionable at the time of dissolution, to the underlying facts. Accordingly,
    the question of whether the agreement was enforceable is a mixed question
    of fact and law subject to plenary review.’’ (Citation omitted.) Bedrick v.
    Bedrick, 
    supra,
     
    300 Conn. 706
    .
    15
    The specific assets that the plaintiff claims should have been included
    as joint property are sealed. See footnote 3 of this opinion.
    16
    General Statutes § 46b-56 (c) provides: ‘‘In making or modifying any
    order as provided in subsections (a) and (b) of this section, the court shall
    consider the best interests of the child, and in doing so may consider,
    but shall not be limited to, one or more of the following factors: (1) The
    temperament and developmental needs of the child; (2) the capacity and
    the disposition of the parents to understand and meet the needs of the child;
    (3) any relevant and material information obtained from the child, including
    the informed preferences of the child; (4) the wishes of the child’s parents
    as to custody; (5) the past and current interaction and relationship of the
    child with each parent, the child’s siblings and any other person who may
    significantly affect the best interests of the child; (6) the willingness and
    ability of each parent to facilitate and encourage such continuing parent-
    child relationship between the child and the other parent as is appropriate,
    including compliance with any court orders; (7) any manipulation by or
    coercive behavior of the parents in an effort to involve the child in the
    parents’ dispute; (8) the ability of each parent to be actively involved in the
    life of the child; (9) the child’s adjustment to his or her home, school and
    community environments; (10) the length of time that the child has lived
    in a stable and satisfactory environment and the desirability of maintaining
    continuity in such environment, provided the court may consider favorably
    a parent who voluntarily leaves the child’s family home pendente lite in
    order to alleviate stress in the household; (11) the stability of the child’s
    existing or proposed residences, or both; (12) the mental and physical health
    of all individuals involved, except that a disability of a proposed custodial
    parent or other party, in and of itself, shall not be determinative of custody
    unless the proposed custodial arrangement is not in the best interests of
    the child; (13) the child’s cultural background; (14) the effect on the child
    of the actions of an abuser, if any domestic violence has occurred between
    the parents or between a parent and another individual or the child; (15)
    whether the child or a sibling of the child has been abused or neglected,
    as defined respectively in section 46b-120; and (16) whether the party satis-
    factorily completed participation in a parenting education program estab-
    lished pursuant to section 46b-69b. The court is not required to assign any
    weight to any of the factors that it considers, but shall articulate the basis
    for its decision.’’
    17
    In support of her claim that the trial court abused its discretion in
    considering Amendola’s testimony, the plaintiff relies on O’Neill v. O’Neill,
    
    13 Conn. App. 300
    , 
    536 A.2d 978
    , cert. denied, 
    207 Conn. 806
    , 
    540 A.2d 374
    (1988). In O’Neil, however, the Appellate Court ordered a new custody
    hearing not because the trial court, in determining custody, improperly
    considered the testimony of a particular witness but, rather, because the
    court had relied entirely on a thirteen month old family relations officer’s
    report notwithstanding the officer’s testimony ‘‘that due to the passage of
    time he could not competently testify as to whether the parties’ stability
    and security had changed since his report.’’ Id., 303. The Appellate Court
    explained that the report was not probative of the best interests of the child
    at the time of the custody determination; see id.; and that, ‘‘[t]o compound
    its error in relying on outdated evidence [that was] not probative of present
    parenting abilities, the trial court admitted that it placed great weight on
    the [outdated] written report . . . .’’ Id. In contrast to O’Neill, the plaintiff
    in the present case does not claim that the trial court’s custody decision
    was based on stale, rather than current, information about the parties and
    their children.