Their families can enjoy the utility of repeater communication without having to take an FCC operator's exam to operate in the radio service. There is a growing number of families buying GMRS radios for use when traveling or for use with family and friends on sporting vacations. Just because you bought a radio with repeater channels included doesn't mean you can use any repeater the radio might actually access for you. GMRS licensees all expect you to ask for permission before your family begins to use the repeater. It is no longer an FCC requirement but it is expected by virtually ALL licensees.
Repeaters are private property.
No one is under any obligation to allow you to use or continue to use any repeater station. The FCC cannot force someone to allow you to use their repeater either. GMRS licensees tend to be very supportive of spouses, children, and other family members that use the radio systems. Where an Amateur Radio or even CB enthusiast might expect every operator to have complex knowledge of procedures and practices, in GMRS we tend to adapt to the operating habits of spouses, children, and friends. We expect that our families will understand and apply what they or are willing to understand about our radio systems.