Which clusters of genetically-linked performers strike you as the most valuable to have around? Which ones are the most entertaining, sincere, and likable? No, you may not say the Jacksons. Your pre-approved choices are as follows:

The Olsen twins. Their homeless chic mixed with their monkey faces and weird ties to Heath Ledger give them an edge of compelling darkness.

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It's got to be rough to be the brother or sister (or even half bro/sis) of a star who's way more movie-star gorgeous than you are--but at least that scenario generally helps you build character. I've come to love the following famous sibs because I always favor the underdog, especially in show biz where every weird facial feature will cost you a million at the box office.

I'll list them along with the rude comments they've no doubt had to endure since entering the public arena:

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The days when Mary-Kate and Ashley Olsen starred in cutesy flicks like How The West Was Fun are as over as era when Nicole Kidman had an expressive forehead. Nowadays, of course, Mary-Kate shows up on Weeds, playing "Tara, a devoted Christian girl who falls in with a family of drug-dealing suburbanites." And I just saw a screening of The Wackness, a cool little film about a young drug dealer in love, and while I'm not at liberty to reveal anything substantial about it just yet, let's just say that Mary-Kate's brief role might not be completely unrelated to narcotics. Of course, none of this means much since, as we know, it takes three instances of anything to create a real trend. And I'm not going to be so horribly low and crass as to mention anything about Heath Ledger here.