Wash. Admin. Code § 415-112-700
(2) The department must receive proof that the beneficiary stands in the necessary relationship to the member, and that either:
[Statutory Authority: RCW 41.50.050(5) and 41.32.520. WSR 05-12-108, § 415-112-700, filed 5/27/05, effective 6/27/05. Statutory Authority: RCW 41.50.050. WSR 99-14-008, § 415-112-700, filed 6/24/99, effective 7/25/99. Statutory Authority: RCW 41.50.050(6) and 41.50.090. WSR 78-03-023 (Order IV), § 415-112-700, filed 2/15/78. Formerly WAC 462-36-010.]