Print the state and county where the form is notarized in the spaces provided. Sign your name in front of a notary.Form Number. Title. PDF. DOC. WPD. GF-17. Fill out the Application for Modification of Court Order or Cross-Application for Modification of a Court Order. In this video we'll cover three terms to always include in the plan the steps to file for custody in New York and how to modify a custody agreement. If you prepare your own petition, file it with the Clerk of Family Court on the 11th floor of the courthouse at. This guide includes forms and instructions for a letter and affidavit to request that the court register an out-of-state custody order in Texas. When you file a document with the Court: o Always include the full case name and file and petition numbers (if there are any). Complete General Form 17 to petition for custody or visitation. 13. Starting A Custody Case.