Thing is, I think I've heard this joke before 2001. It wasn't quite as vile, and I'm not quite sure the punchline was "the Aristocrats!" However, it did involve a family act that got quite disgusting, with the point that they were satirizing the upper class/monarchy/something or the other. Only problem is, I can't remember where I heard it. I've read quite a few books about Yiddish humor and/or Catskills jokes, plus I was on a BBS for a few years and read every humor section obsessively. And my memory sucks about jokes. :)