Washington Revised Code Title 26. Domestic Relations § 26.16.120. Agreements as to status

Nothing contained in any of the provisions of *this chapter or in any law of this state, shall prevent both spouses or both domestic partners from jointly entering into any agreement concerning the status or disposition of the whole or any portion of the community property, then owned by them or afterwards to be acquired, to take effect upon the death of either. But such agreement may be made at any time by both spouses or both domestic partners by the execution of an instrument in writing under their hands and seals, and to be witnessed, acknowledged and certified in the same manner as deeds to real estate are required to be, under the laws of the state, and the same may at any time thereafter be altered or amended in the same manner. Such agreement shall not derogate from the right of creditors; nor be construed to curtail the powers of the superior court to set aside or cancel such agreement for fraud or under some other recognized head of equity jurisdiction, at the suit of either party; nor prevent the application of laws governing the community property and inheritance rights of slayers or abusers under chapter 11.84 RCW.