[bitwize]

The nuclear family is an artifice probably promoted by suburban land developers and durable goods manufacturers during the 40s and 50s or something.

Humans naturally live in extended families three or more generations deep.

[cafard]

Gee, yesterday I was just reading in Hegel's Philosophy of Right that properly speaking the nuclear family is the family.

I can't speak to other countries, but the United States has tended to be unusually mobile. That can make the extended family household hard to maintain.