First of all, repeaters are neither allowed nor possible on FRS. There is no provision for repeater inputs in a separate band segment. There might be operators in other radio services using FRS as an input to a cross-band repeater. But, that is distinctly and strictly prohibited by the rules. As to ham operators who do not have GMRS licenses. If they are talking on the GMRS frequencies, they are doing so illegaly. Otherwise, there is nothing compelling a ham operator to have a GMRS license. And, yes, there are no doubt hams operating on GMRS using ham equipment. However, they typically do not go around announcing that is what they are doing, and they certainly do not claim that they have some special need or right to do so. But, regardless of examples of others who might be flouting the rules, their indiscretions do not in any way change the licensing requirements you agreed to to get your GMRS license. And, to be blunt. If someone is unwilling or incapable, regardless of age or other reason, of correctly operating under your GMRS license. Then you, as the license holder are responsible and you must prevent them from using the station. If your grand children cannot comply with the rules, they cannot use a radio operating under the GMRS rules. Period. By and large, the people on this forum support the GMRS service and want to see it remain useful and relevant. Arguing publicly that the rules do not apply to this or that special case is counter to those ends. If you still think you know better, or that your needs are special, or whatever, then go ahead and do whatever you want. Nobody will ever know anyway. But, please do not claim that your special needs come first and expect others to support you. And, please have a little more faith is your grand-children and children in general. They learn quickly and like to do things right.