A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions. How to fill out the Grandparent Medical Consent Form for Minors?This consent form should be taken with the child to the Physician's office when the child is taken for treatment. This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas. For registration and billing purposes, please be sure to fill forms out completely. This is to ensure all families will be linked in our records correctly. To submit an application, please fill out the attached forms and submit them along with copies of all required documentation. 1. Enter the child's full name and personal details.