(1) A signatory may rescind an acknowledgment of parentage or denial of parentage by filing with the state registrar of vital statistics a rescission in a signed record which is attested by a notarial officer or witnessed, before the earlier of:

(a) Sixty days after the effective date under RCW 26.26A.215 of the acknowledgment or denial; or

(b) The date of the first hearing before a court in a proceeding, to which the signatory is a party, to adjudicate an issue relating to the child, including a proceeding that establishes support.

(2) If an acknowledgment of parentage is rescinded under subsection (1) of this section, an associated denial of parentage is invalid, and the state registrar of vital statistics shall notify the woman who gave birth to the child and the individual who signed a denial of parentage of the child that the acknowledgment has been rescinded. Failure to give the notice required by this subsection does not affect the validity of the rescission.