A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions. The grandparent medical consent form is a document that gives permission to a grandparent to make health care decisions on behalf of a minor child.Easily grant medical decision-making authority for your child with a custom Child Medical Consent form. Protect your child's health in any situation. My MIL is asking for the birth cert, a medical contract (so they have the power to make medical decisions for him). There are specific medical power of attorney forms online giving consent for grandparents or other relatives to make care decisions for children. Do you need a grandparents' medical consent form? Here are downloadable medical consent form templates that you can use for a child's grandparents. These forms are especially essential for children who spend a significant amount of time away from home, either with a babysitter, grandparents or with some.