The Washington Petition To Challenge Paternity Acknowledgement And Or Denial of Paternity is a legal document filed in Washington State courts in order to challenge a paternity acknowledgement or denial. This document can be used by a person who believes they are the parent of a child, but a court has not yet established paternity. It can also be used by a person who believes they are not the parent of a child, but a court has already established paternity. The petition requests the court to set aside the acknowledgement or denial of paternity and order genetic testing to determine the parentage of the child. There are two types of Washington Petition To Challenge Paternity Acknowledgement And Or Denial of Paternity: Acknowledgement and Denial. When filing an Acknowledgement petition, the petitioner requests the court to set aside the acknowledgement of paternity and order genetic testing. When filing a Denial petition, the petitioner requests the court to set aside the denial of paternity and order genetic testing. Both petitions must be accompanied by an affidavit and other supporting documents.