A grandparents' medical consent form allows a parent or legal guardian to hand over all responsibility regarding their child's healthcare decisions. These are the official forms for use in Family Court proceedings.How to fill out the Grandparent Medical Consent Form for Minors? The above forms are either local Nassau County Family Court forms or enhanced versions of official statewide forms for use in Family Court proceedings. Our firm is prepared to assist you the best way we can, so fill out the form below or call us at (631) 731-1042.