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"The richest families in Florence in 1427 are still the richest families in Florence"

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

Here is some data showing 70% by the second generation and 90% by the third:

https://www.google.com/amp/amp.timeinc.net/time/money/392530...

Perhaps you just met some of the exceptions.

Do you have data that isn't a blatant ad campaign consisting of pithy statements from a wealth management company trying to scare people into letting them manage their money?

Exactly this. It's extremely difficult to lose your money at that stage.