The parent issue is a cultural thing I think. I do not know any parents where I come from who would prefer to live with their married children. And this hardly ever happens. IF it does, then they have arrangements where they do not interfere with each others lives. Most parents , where I come from, are able to take care of themselves financially and do not require the help of their children.
Of course, there are also cases where parents are in need and are neglected, unfortunately.