This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas. Sworn Statement-1-Affidavit.Last Update: 6-16-05. Filers in Dallas County can now e-file an Uncontested Divorce Without Children and Adult Name Changes through Guide and File! You write a DECLARATION, under PENALTY OF PERJURY and state in the beginning: I JANE SMITH, DECLARE: 1. Forms for use in the District Courts. This Texas child custody affidavit form may help you provide evidence to the court of how these factors apply to your specific case. This form is used as proof to the court that a custodial or noncustodial parent is in the military. File this form when you and the other party cannot agree to a temporary arrangement for parenting, child support, or other issues before the final hearing date.