Washington Revised Code Title 11. Probate and Trust Law § 11.76.095. Distribution of estates to minors

(1) The money be deposited in a bank or trust company or be invested in an account in an insured financial institution for the benefit of the minor subject to withdrawal only upon the order of the court in the original probate proceeding, or upon said minor's attaining the age of eighteen years and furnishing proof thereof satisfactory to the depositary;

(2) A general guardian shall be appointed and qualify and the money or property be paid or delivered to such guardian prior to the discharge of the personal representative in the original probate proceeding; or

(3) A custodian be selected and the money or property be transferred to the custodian subject to chapter 11.114 RCW.