1.I agree with this opinion, because I know only a few adult persons, who'd live with their elderly grandparents. In my opinion that is, because when children become grown and usually go to an university or get to a work , they often forget about their grands who were ever given them all of their love and help,when their relatives needed.
2.Thats right ,because when children do things like that , what happens very often, they want to show their independence.
3.All of grandparents want to live vicinity with new young and adult generation of their family and help them or give them their experience.