I believe the expression is `going on a ski trip' - when you spend your kids' inheritance!
Paris, in my opinion, has done `a lot worse' than it looks on the face of it. Before the Paris phenomenon, the Hilton name was respectably associated with a hotel chain, big business, and nothing more. Now, when people hear the word `Hilton' they sneer, and scoff, and think of it with contempt and derision. Now that is a HUGE deal, and one that can only be attributed to Paris and her behaviour. If one member of my family single-handedly managed to change public opinion about my whole family, business and legacy because of their behaviour, you can bet darn sure I'd be furious and sick about it too.
So maybe it's not the sex scandal, the breaking of the law, the drunk driving, the drugs, or the jail term, but the sullying of an old and established family name that was just the last straw for Grandpa Hilton. And fair enough, too.