Gordon Ramsey came out recently and said exactly that; that he wants his kids to make it on their own. He's not leaving a penny of his fortune to them.
On one hand, I completely understand it, and a part of me even agrees with the reasoning behind it. But on the other hand.....man, that must suck being the offspring of a wealthy person and knowing that you aren't getting a penny of that money.
I long ago decided that if by some miraculous luck I won the lottery one day, I'd give my parents $5 million of it and wish them a happy life. Perhaps it's different giving prize money to your family as opposed to earned money, which you worked hard for.
There could be any number of reasons why Thomas's sister was driving a 20 year old car. And while I'm not suggesting that this was the case for her, it should be a sad note that often times the families of celebrities turn out to be less-than-admirable characters who fleece off the wealth of their loved one. Many are the stories of pro athletes who let their families in on the wealth, and they ended up either being completely irresponsible with the money, or downright criminal with openly stealing it.