> Also what about other historic kinship societies (e.g. Scottish, Italian?)

Low sample size but I know a few Sicilian families and there was a bit of intergenerational living, paying for family members to emigrate etc but it always seemed very focussed on working hard so that the next generation had it better.

Some were a bit showy with their wealth but most lived modestly - my Dad theorised that in rural Sicily early last century, showing your wealth would probably ear-mark you for a shake-down or some other targeted crime, so people learned to live modestly and keep their wealth quiet.