RCW 68.32.060

Whenever an interment of the human remains of a member or of a relative of a member of the family of the record owner or of the remains of the record owner is made in a plot transferred by deed or certificate of ownership to an individual owner and both the owner and the surviving spouse or state registered domestic partner, if any, die with children then living without making disposition of the plot either by a specific devise, or by a written declaration filed and recorded in the office of the cemetery authority, the plot shall thereafter be held as a family plot and shall be subject to sale only upon agreement of the children of the owner living at the time of sale.