I'm not at all in denial of the genetic links to autism and can see the genetic family trail, as it were, on both sides of our family BUT I also believe the genetic link, for some, extends as far as a potential/tendency which may or may not be triggered by any number of factors - one of which, for some, can imho be vaccination.
I don't believe my ds1's autism was caused by the MMR, but I am pretty sure it badly affected his immune system and was highly suspect in causing a lot of his digestive problems. He was literally never ill prior to the MMR, yet pretty much immediately after having it he became extremely weak and debilitated, had virus after virus, developed repeated scarlett fever infections that wouldn't respond to treatment and his lymph nodes were inflamed for over a year.
Both my boys had their MMR (ds1 had both sets, although I delayed his pre-schools after his bad reaction to the first lot and ds2 only had the first lot and still hasn't had his pre-school booster at nearly 8 years old) but dd (NT and 3 years old) hasn't had it at all. I was waiting until she had passed 3 years old, but my gut instinct (not to be confused with fear or panic) is still telling me not to. So far she has shown absolutely no sign of ASD, whereas ds1 is dxd and ds2 has definite traits, just not enough for a dx.
I am not 100% comfortable with my decision. I worry about her contracting measles and not only the effect it could have on her, but also on others she may infect if she does get it. It has not been an easy decision for me/us and I would say its probably still a decision in progress rather than a done deal. I am currently thinking that, if I can find somewhere reputable, I may go for the single jabs and she will just have to wait for the mumps element until she is older.