The Washington Petition to Invalidate (Annul) Registered Domestic Partnership is a legal document used in the state of Washington to end a Registered Domestic Partnership. This petition is used to dissolve the partnership and declare it invalid, thus restoring both parties to their single status. The petitioner must have a valid reason for annulment, such as fraud or misrepresentation. The petition must be filed in the county court where either partner resides or in the county where the domestic partnership was registered. The court will review the petition and then determine whether it meets the legal requirements for annulment. There are two types of Washington Petition to Invalidate (Annul) Registered Domestic Partnership: 1) Petition to Invalidate Registered Domestic Partnership; and 2) Petition to Invalidate Registered Domestic Partnership with Children. The first type is for situations where the partners do not have children, while the second type is for domestic partnerships with children. Both types of petitions must be accompanied by supporting documents and evidence. For instance, if the petitioner alleges fraud, then they must provide proof to support the allegation.