Rise of the full nesters: what life is like with adult children (theguardian.com)

While it is a change when compared to recent years, we’ve seen this in one version or another in the past or in other cultures.

> In many cultures, such as in those of Asians, Middle Easterners, Africans, (…) Southern Europeans (Orthodox/Catholic countries), extended families are the basic family unit.

https://en.wikipedia.org/wiki/Extended_family

I live with my 4 adult sons (was 5 but 1 moved) because we're in a 4 income economy.