Wash. Rev. Code § 48.23.320
Upon the death of the insured and except as is otherwise expressly provided by the policy or premium deposit agreement, a life insurer may pay to the surviving spouse, children, beneficiary, or other person other than the insured's estate, appearing to the insurer to be equitably entitled thereto, sums held by it and comprising:
[1947 c 79 s .23.32; Rem. Supp. 1947 s 45.23.32.]