The US and the UK (probably less so now than in the past) have a more extreme focus on the nuclear family than other countries. There have been all sort of exp

The US and the UK (probably less so now than in the past) have a more extreme focus on the nuclear family than other countries. There have been all sort of explanations offered from the Church promoting the nuclear family to reduce the power of extended family/clans to the black plague creating a housing surplus in England.