As they say you can't choose your family, but you can choose friends, so I can see how many/most of the people would choose between age 20-40 to stay away from family, then when you have your own kids you will start seeing your parents in different context as you became parent and see you was maybe more harsh on them than they deserved plus them helping with watching grandkids is also bonus (this doesn't really apply to me, my mother is 4 hours away by train, father 6 hours and inlaws 11 hour flight.