Wash. Rev. Code § 11.04.095
If a person dies leaving a surviving spouse or surviving domestic partner and issue by a former spouse or former domestic partner and leaving a will whereby all or substantially all of the deceased's property passes to the surviving spouse or surviving domestic partner or having before death conveyed all or substantially all his or her property to the surviving spouse or surviving domestic partner, and afterwards the latter dies without heirs and without disposing of his or her property by will so that except for this section the same would all escheat, the issue of the spouse or domestic partner first deceased who survive the spouse or domestic partner last deceased shall take and inherit from the spouse or domestic partner last deceased the property so acquired by will or conveyance or the equivalent thereof in money or other property; if such issue are all in the same degree of kinship to the spouse or domestic partner first deceased they shall take equally, or, if of unequal degree, then those of more remote degree shall take by representation with respect to such spouse or such domestic partner first deceased.
RCW 11.04.095
Part headings not law-Severability-2008 c 6: See RCW 26.60.900 and 26.60.901.