This is something I always found fascinating. In my country, even married people sometimes live with their parents in multigenerational housing because it's mutually beneficial: in their old age, the parents are not isolated or abandoned and help you with the kids if necessary. So you don't pay for a babysitter. If the home is reasonably comfortable, it saves you money you'd spend on building one from scratch. That means you and your kids inherit real estate. While in the US, adults who live with their families are regarded as losers.