A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions. The form allows them to authorize medical treatment when you cant be contacted.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. There are specific medical power of attorney forms online giving consent for grandparents or other relatives to make care decisions for children. 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.