Why do celebritys end up morphing into thier older celeb sibling?

Well, I disagree about the Nicky Hilton part because you barely hear anything about her, but for everyone else I totally agree. It's a lot of pressure being the younger sibling of someone who's already famous, and then your trying to get into the business too. So I bet to get attention they have to act more like there older sibling, and guess what? It usually works!