Nobody in my family, not even I, have been formally diagnosed on the spectrum.
My mom suspected I was mildly autistic when I was little, but doctors rejected the theory (this was before it was officially announced in the US). My sister doesn't seem to show any signs, all I can get out of my brother is that he likes to listen to the same song over and over, and on games picks the same things. My mother has had problems with people and I finally got her to admit that it doesn't get easier. My dad in his teens was on Ritalin (no formal adhd diagnosis).
Overall, I'm the worst off out of my family, and I've only had two doctors say I have asperger's (nothing extensive or official). Nothing was even suggested when I was a child, and I was even held back a grade for being "socially immature". Red lights, anyone? Guess I was unlucky.
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Permanently inane.