A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions. My MIL typically watches my 13 mo three days a week, for about six hours each day while my husband and I are both working.Create, print or obtain a free Youngster Medical Consent kind in minutes. A must have for folks of minors. Property. How to fill out the Grandparent Medical Consent Form for Minors? There are specific medical power of attorney forms online giving consent for grandparents or other relatives to make care decisions for children.