This chapter of the Texas Family Code describes who can file a SAPCR, how they must do so, and what the petition must contain. Texas Family Code, Chapter 103.The primary form you will need is a "petition" for a suit affecting the parent-child relationship. If the judge decides your agreement is in the child's best interest, and you file a SAPCR, the judge will sign an order based on your agreement. If you're looking to file for full custody in Texas, you have two paths open to you. 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. This guide tells you how to ask for a custody, visitation, child support, medical support, and dental support order. Navigating the complexities of child custody laws can be a daunting task, especially in the diverse legal landscape of the United States. The following forms are available for downloading, printing and completing. You will need to fill out a Civil Case Information Sheet form, which you can get at the courthouse.