Washington Revised Code Title 11. Probate and Trust Law § 11.28.120. Persons entitled to letters

(1) The surviving spouse or state registered domestic partner, or such person as he or she may request to have appointed.

(2) The next of kin in the following order: (a) Child or children; (b) father or mother; (c) brothers or sisters; (d) grandchildren; (e) nephews or nieces.

(3) The trustee named by the decedent in an inter vivos trust instrument, testamentary trustee named in the will, guardian of the decedent, conservator of the decedent, or an agent named in a durable power of attorney appointed by the decedent, if any such a fiduciary controlled or potentially controlled substantially all of the decedent's probate and nonprobate assets.

(4) One or more of the beneficiaries or transferees of the decedent's probate or nonprobate assets.

(6) One or more of the principal creditors.

(7) If the persons so entitled shall fail for more than forty days after the death of the decedent to present a petition for letters of administration, or if it appears to the satisfaction of the court that there is no next of kin, as above specified eligible to appointment, or they waive their right, and there are no principal creditor or creditors, or such creditor or creditors waive their right, then the court may appoint a contract service provider with the office of public guardianship and conservatorship under chapter 2.72 RCW or any suitable person to administer such estate.