I think if the family planned for this to be the case, then child-rearing and then independence-rearing measure would be utilized for this success. In my own experience and ones of friends, you get too similarly different to your parents to be around them. Having weird arguments about the most effective way to wash dishes and stuff. If you had land then you could just build a smaller house out back or something, or if you have like 2 floors then one could be given to the child/ren who are of age and stacking until they buy some of their own property/adjacent properties/whatever. It would require an entirely different familial dynamic, and as we have it barely together as it is, it would take a lot of love and clear communication(!!!) to be able to make it work. It would be possible with the right partner I imagine.