RCW 26.26A.410: Notice of proceeding to adjudicate parentage.

(1) The petitioner shall give notice of a proceeding to adjudicate parentage to the following individuals:

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

(b) An individual who is a parent of the child under this chapter;

(c) A presumed, acknowledged, or adjudicated parent of the child; and

(d) An individual whose parentage of the child is to be adjudicated.

(2) An individual entitled to notice under subsection (1) of this section has a right to intervene in the proceeding.

(3) Lack of notice required by subsection (1) of this section does not render a judgment void. Lack of notice does not preclude an individual entitled to notice under subsection (1) of this section from bringing a proceeding under RCW 26.26A.450(2).

(4) Notice must be by service of the summons and complaint on all parties entitled to receive notice under subsection (1) of this section.

(5) In cases where the child is dependent or alleged to be dependent under chapter 13.34 RCW, the petitioner shall give notice to the state agency administering the plan under Title IV-E of the social security act.