Washington Petition to Decide Parentage (after Acknowledgment or Court Decision) is a legal document used to legally establish the parentage of a child when paternity has already been established by either an acknowledgment of parentage or a court decision. This document is used to create a legal relationship between a biological parent and the child, and to ensure that the parent is granted all the rights and responsibilities associated with being a parent. If the parent and child are not related by marriage, the petitioner must file a separate document to establish paternity. There are two types of Washington Petition to Decide Parentage: one for an acknowledgment of parentage, and one for a court decision. The petition must be signed by the petitioner (the parent or legal guardian of the child) and the respondent (the other parent). The petition must include the full names, birthdates, and addresses of both the petitioner and respondent, as well as the names and birthdates of any children involved in the parentage case. It must also include the date and location of the court order or acknowledgment, as well as any additional information the petitioner wishes to include. The petition must be accompanied by a copy of the court order or acknowledgment of parentage, and must be filed in the Superior Court of the county in which the respondent resides.