Like I grew up with them and their parents and grandparents and aunts and uncles and cousins, did holidays and really know each others families quite well. More than I had a friend from X in 8th grade. It’s not hard to understand unless you have not experienced it yourself.
I grew up in one of the most diverse cities in the US and was pretty poor (not in some white enclave). On my street I think we had families from 16 different countries, all continents represented often multiple nationalities from each, and we frequently had block parties and gatherings out in the street.