Section 26.26A.485 - Proceeding to adjudicate parentage-Child as party-Representation(1) A minor child is a permissive party but not a necessary party to a proceeding under RCW 26.26A.400 through 26.26A.515.(2) The court shall appoint a guardian ad litem, subject to RCW 74.20.310, to represent a child in a proceeding under RCW 26.26A.400 through 26.26A.515, if the court finds that the interests of the child are not adequately represented.