1. (1) Except as otherwise provided in subsection (2) of this section:

   1. (a) A signatory to an acknowledgment of parentage or denial of parentage is bound by the acknowledgment and denial as provided in RCW 26.26A.200 through 26.26A.265; and
   2. (b) A party to an adjudication of parentage by a court acting under circumstances that satisfy the jurisdiction requirements of RCW 26.21A.100 and any individual who received notice of the proceeding are bound by the adjudication.

2. (2) A child is not bound by a determination of parentage under this chapter unless:

   1. (a) The determination was based on an unrescinded acknowledgment of parentage and the acknowledgment is consistent with the results of genetic testing;
   2. (b) The determination was based on a finding consistent with the results of genetic testing, and the consistency is declared in the determination or otherwise shown;
   3. (c) The determination of parentage was made under RCW 26.26A.600 through 26.26A.635 or 26.26A.700 through 26.26A.785; or
   4. (d) The child was a party or was represented by a guardian ad litem in the proceeding.

3. (3) In a proceeding for dissolution of marriage or domestic partnership, the court is deemed to have made an adjudication of parentage of a child if the court acts under circumstances that satisfy the jurisdiction requirements of RCW 26.21A.100 and the final order:

   1. (a) Expressly identifies the child as a "child of the marriage," "issue of the marriage," "child of the domestic partnership," "issue of the domestic partnership," or includes similar words indicating that both spouses in the marriage or domestic partners in the domestic partnership are parents of the child; or
   2. (b) Provides for support of the child by a spouse or domestic partner unless that spouse or domestic partner's parentage is disclaimed specifically in the order.
4. (4) Except as otherwise provided in subsection (2) of this section or RCW 26.26A.450, a determination of parentage may be asserted as a defense in a subsequent proceeding seeking to adjudicate parentage of an individual who was not a party to the earlier proceeding.
5. (5) A party to an adjudication of parentage may challenge the adjudication only under law of this state other than this chapter relating to appeal, vacation of judgment, or other judicial review.

[ 2018 c 6 s 523.]