Both of my sisters have traits (and Alice will probably be diagnosed with ADHD or something similar, she's definitely not autistic, but definitely not normal), although interestingly my brother doesn't. Both of my parents think they have traits too - mum probably OCD in my opinion though. Dad has lots of traits though - at the moment he's obsessed with Runescape and we pretty much haven't seen him for two years because he spends all his time at home on the computer, but he's also very insensitive about stuff (is that just a male thing?), and can really fly off the handle.
Don't know about the wider family, I don't really know any of them that much. I think mum thinks my auntie Rachel has something, but she's very similar to Alice. Plus, she had measles or something when she was a kid that led to a period of pschocitic (bleh, I can't spell any more) stuffs. When I was at my grandma's a couple of Easters ago and had to ask for a pair of scissors to cut the label off the back of a shirt she told me that after she was ill, she'd had to cut all the labels out of Rachel's clothes because she thought they were hairy cattapillas coming to get her! XD
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I would be the laziest girl in the world, but it's too much effort.