Washington Revised Code Title 26. Domestic Relations § 26.26A.405. Standing to maintain proceeding to adjudicate parentage

(1) The child;

(2) The woman who gave birth to the child, unless a court has adjudicated that she is not a parent;

(3) An individual who is a parent under this chapter;

(4) An individual whose parentage of the child is to be adjudicated;

(5) The division of child support;

(6) An adoption agency authorized by law of this state other than this chapter or licensed child placement agency; or

(7) A representative authorized by law of this state other than this chapter to act for an individual who otherwise would be entitled to maintain a proceeding but is deceased, incapacitated, or a minor.