A Washington Petition to Disprove Parentage of Presumed Parent is a legal document used to challenge the parent-child relationship between a person and a child. This petition is typically filed when a person claims to be a child's parent but is not legally recognized as such or if the presumed parent is not the biological parent. Depending on the circumstances, there are two types of Washington Petitions to Disprove Parentage of Presumed Parent: a Petition to Terminate the Presumed Parent's Rights and a Petition to Establish Paternity. The Petition to Terminate the Presumed Parent's Rights is used when the parent-child relationship needs to be legally terminated. This petition can be filed by either the presumed parent or the child's biological parent. The Petition to Establish Paternity is used to establish the legal parent-child relationship between a father and child. This petition is typically filed by the child's mother. Both types of petitions require evidence to prove that the presumed parent is not in fact the child's parent.