Not sure what to make of that first link. The first one is a bunch of quotes about wealthy people worrying that their kids are irresponsible and this one uncited sentence aligned with the headline:

> Indeed, 70% of wealthy families lose their wealth by the second generation, and a stunning 90% by the third, according to the Williams Group wealth consultancy.

What is that? Sounds like a marketing claim by a company catering services to the wealthy about how to keep their family wealth. I can't just accept it blindly.

I agree that in the (unusual) case of Gates, he's obviously not just hoarding and passing on his wealth directly, but the upbringing and advantages his kids are getting plus $10 million leaves them still really wealthy compared to nearly anyone else on the planet regardless of the fact that it's a miniscule fraction of Gates' current wealth.