Other cultures have adapted to a family in different ways. Some Iranians had a "compound" model not unlike a roman villa with a central water pond, and as you grew into adulthood you moved into another discrete component of the family compound and as you matured and people died, you moved up the chain to better rooms. It's in "my uncle napoleon" if I recall correctly. Lots of cultures might do something like this, and it comes with its own mixed blessings of hierarchy inside the family unit, conformance, obligations.