Did he for sure get autism from the vaccine?

Our neighbors son is 6 and he has autism. He is non-verbal and bangs his head a lot and runs around all day. They say that he was completely normal before and was starting to talk and then he got his chicken pox vaccine and had convulsions 15 minutes after and was never the same. They claim that he was given the... show more Our neighbors son is 6 and he has autism. He is non-verbal and bangs his head a lot and runs around all day. They say that he was completely normal before and was starting to talk and then he got his chicken pox vaccine and had convulsions 15 minutes after and was never the same. They claim that he was given the last dose of a 3 vile shot that was never shaken for the first two kids so by the time their son got it there was too much mercury in it. If that is true then doesn't that prove that is the cause of Autism? I just don't understand because there are more boys with it and how do they know that the vile wasn't shaken like it was supposed to. Do they still do the 3 vile shot things or whatever it is that they were talking about? It is so scarey. We have a 2 year old and he has had all of his shots up to date and is fine and we have another little boy on the way and I'm scared now for him to get his vaccines but I know he needs them.
Does anyone have anything to share on this at all? Plus I thought it was the MMR shot that had the mercury in it..is it the chicken pox vaccine too? What can I do to protect our baby from having something like this happen?
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