I love how all these articles assume families are functional and they all act in the best interest of each other.
I submitted it because I saw a comment somewhere else about the rich being locked into unfair advantages and classes ossifying. Seems to not be true if these stats are to be believed.
Even those families who somehow manage to build up wealth likely to lose it within two generations. Meanwhile the ultra-wealthy are able to continue being ultra-wealthy from one generation to the next regardless of how competent that generation is.