(1) Except as otherwise provided in subsection (2) of this section, the court may combine a proceeding to adjudicate parentage under this chapter with a proceeding for adoption or termination of parental rights under chapter 26.33 RCW; determination of a parenting plan, child support, annulment, dissolution of marriage, dissolution of a domestic partnership, or legal separation under chapter 26.09 or 26.19 RCW; or probate or administration of an estate under chapter 11.48 or 11.54 RCW; or other appropriate proceeding.

(2) A respondent may not combine a proceeding described in subsection (1) [of this section] with a proceeding to adjudicate parentage brought under the uniform interstate family support act, chapter 26.21A RCW.