(1) A person may commence a judicial proceeding to contest the validity of a trust that was revocable at the trustor's death within the earlier of:
(a) Twenty-four months after the trustor's death; or
(b) Four months after the trustee sent to the person by personal service, mail, or in an electronic transmission if there is a consent of the recipient to electronic transmission then in effect under the terms of RCW 11.96A.110, a notice including:
(i) The name and date of the trust;
(ii) The identity of the trustor or trustors;
(iii) The trustee's name, address, and telephone number; and
(iv) Notice of the time allowed for commencing a proceeding.
(2) Upon the death of the trustor of a trust that was revocable at the trustor's death, the trustee may proceed to distribute the trust property in accordance with the terms of the trust, unless:
(a) The trustee knows of a pending judicial proceeding contesting the validity of the trust; or
(b) A potential contestant has notified the trustee of a possible judicial proceeding to contest the trust and a judicial proceeding is commenced within sixty days after the contestant sent the notification.
(3) A beneficiary of a trust that is determined to have been invalid is liable to return any distribution received.