This article contains information on one way that certain nonparents can be allowed to consent to medical treatment of a minor child. A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions.If the child has never been the subject of court proceedings, one parent (or both) may enter into an authorization agreement with any adult caregiver. A parent can sign an "authorization agreement" form to give a nonparent the authority to care for and make decisions for a child. Ensure your child's well-being with our easy-to-use child medical consent form. Purpose. To obtain an individual's authorization to release medical information to: the Texas Health and Human Services Commission (HHSC). Grandparent Consent to Minor (Child) – Specifically for grandparents who will have the legal right to choose the medical treatment for a minor (child).