> multi generational household
> most people cannot
I dont know if "cannot" is the right verb here. I bet if you asked enough euromericans if they'd choose to live with extended family the answer would be "only in extreme and deprived circumstances".
Isn't a common excuse for not having children that couples can't afford their own home?
Sure, but consider the economic factors that go into it. How many extended families would be perfectly happy to live together, but are unable to even consider it in the first place because of what the costs for that sort of multigenerational housing would look like?