A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions. This affidavit is sufficient to authorize the grandparent signing to exercise care, physical custody, and control of the child who is its subject.Ensure your child's well-being with our easy-to-use child medical consent form. This consent form should be taken with the child to the hospital or physician's office when the child is taken for treatment. This form is for grandparents who are taking full-time care of their grandchildren, sometimes called grandparent kinship care. Caretaker authorization affidavit. Gives circumstances in which grandparent can get custody rights without contacting grandchild's parents. Grandparent Consent to Minor (Child) – Specifically for grandparents who will have the legal right to choose the medical treatment for a minor (child). This person must be 18 years of age or older. Please complete the following: I, (Full Name of Parent or Legal Guardian). (Address).