Wash. Rev. Code § 48.25.160
Such a policy may also provide that if the beneficiary designated in the policy does not surrender the policy with due proof of death within the period stated in the policy, which shall not be less than thirty days after the death of the insured, or if the beneficiary is the estate of the insured or is a minor, or dies before the insured or is not legally competent to give a valid release, then the insurer may make payment thereunder to the executor or administrator of the insured, or to any of the insured's relatives by blood or legal adoption or connection by marriage, or to any person appearing to the insurer to be equitably entitled thereto by reason of having been named beneficiary, or by reason of having incurred expense for the maintenance, medical attention or burial of the insured. Such policy may also include a similar provision applicable to any other payment due under the policy.
RCW 48.25.160