Washington Revised Code Title 11. Probate and Trust Law § 11.68.130. Power to construe and interpret will

(a) A party, as defined in RCW 11.96A.030, may either petition the court under chapter 11.96A RCW to have an ambiguous provision of a probated will construed by the court or may otherwise address, resolve, and settle the matter under the procedures provided under chapter 11.96A RCW; and

(b) There is a rebuttable presumption that the construction of an ambiguous provision that is made by a personal representative with nonintervention powers is consistent with the intent of the testator.