I grew up in a "nuclear family" and had plenty of regular contact with grandparents, uncles and aunts. Perhaps the American version thereof has more issues, as

I grew up in a "nuclear family" and had plenty of regular contact with grandparents, uncles and aunts. Perhaps the American version thereof has more issues, as young people are expected/encouraged to move 1000s of miles from their parent's house to maximize their economic output? Oh, it's just a few hours flight, no worries. In practice, family reunions happen at best once a year.