This has got to be restricted to landed gentry.
I know a family who claim to be Irish decent. The three siblings lived with their parents until the female bought a unit. Then all three siblings ended up living there until one male sibling was forced to marry the female siblings best friend. The remaining male and female are in late 30's.
They have two elderly spinster great aunts who live out in the bush in a godforsaken farm house. Of their uncles on their mum's side, one looked after a family farm(different farm) his whole life so that the other could go and breed. None of it's planned but total Stem Family.
I find this article to be true to life. Additionally, it is very helpful because we tend to think of only two types of family, the communitarian and the nuclear. This makes it easy for people to mislead into believing that the two options are conservatism vs "the modern family"(of the TV show).
We are so easily used against our nature when led into oppositional mentality.