Heard that proverb. I'm more inclined to believe rich families from 1400s are rich now. Family wealth can be preserved by sending spare sons and daughters to monastic life.

https://qz.com/694340/the-richest-families-in-florence-in-14...

The grandson was in FFA (Future Farmers of America) in high school. My guess is the Buffett family values environment was not typical suburban USA.

Buffett’s giving almost all his wealth away so not the usual rags-to-rags.

The grandson has a pretty successful career already anyways (helped obviously by his relation to Warren)