Wash. Rev. Code § 11.130.570
(1) A conservatorship for a minor terminates on the earliest of:
(3) An individual subject to conservatorship, the conservator, or a person interested in the welfare of the individual may petition for:
(4) The court shall hold a hearing to determine whether termination or modification of a conservatorship is appropriate on:
[ 2019 c 437 s 431.]