with respect to those claims, notwithstanding that the settlement agreement was incorporated into the decree.
When the family court was created, the Legislature amended the statute delimiting the superior court’s jurisdiction so as to deny it jurisdiction over actions cognizable in the family court. 4 V.S.A. § 113 (superior court has original and exclusive jurisdiction over all original-civil actions except “those made cognizable by. . . the family court”). The family court has exclusive jurisdiction over divorce proceedings, which includes the distribution of marital property. 4 V.S.A. § 454(4); 15 V.S.A. § 751(a). Within such proceedings, Vermont law allows — in fact, favors — agreements between divorcing parties to settle the distribution of marital property. Bendekgey v. Bendekgey, 154 Vt. 193, 197, 576 A.2d 433, 435 (1990); see Kanaan v. Kanaan, 163 Vt. 402, 413, 659 A.2d 128, 135 (1995) (record must demonstrate compelling reason for court not to accept parties’ pretrial agreement). Such agreements are presumed to be fair, and will be set aside only upon a showing of fraud, unconscionable advantage, impossibility of performance, hampering circumstances beyond the parties’ expectations, collusion, or duress. Bendekgey, 154 Vt. at 197-98, 576 A.2d at 435-36.
Once the family court adopts a settlement agreement and incorporates it into the divorce order, the agreement becomes part of the judgment of the court and is assailable only through a motion to set aside the judgment. See Viskup v. Viskup, 149 Vt. 89, 90-91, 539 A.2d 554, 556 (1987) (divorce decree’s property distribution is final and not subject to modification, absent circumstances recited in V.R.C.P. 60(b)); Flynn v. Flynn, 265 P.2d 865, 866 (Cal. 1954) (even if merger is not intended, incorporation of settlement agreement renders its validity res judicata in any later action attacking it); Johnston v. Johnston, 465 A.2d 436, 439 (Md. 1983) (accord); cf. Manosh v. Manosh, 160 Vt. 634, 634, 648 A.2d 833, 835 (1993) (mem.) (where settlement agreement was acknowledged but not incorporated into divorce order, family court had jurisdiction to consider wife’s motion to reopen divorce on grounds that agreement was unconscionable); Elmore v. Elmore, 159 Vt. 278, 280, 617 A.2d 159, 161 (1992) (family court adopted parties’ post-judgment agreement as its own determination by incorporating it into prior divorce order). Collateral attacks on the validity of the judgment are thereafter barred under principles of res judicata. Hamilos v. Hamilos, 465 A.2d 445, 448-49 (Md. 1983); e.g., Lerman v. Lerman, 148 Vt. 629, 629, 528 A.2d 1121, 1122 (1987) (mem.) (res judicata precluded father, who had opportunity to litigate