Obviously those hysterical believers in any causal link between Vaccination and diverse neurological disorders will never ever accept anything as mundane as simple empirical data, but still maybe this might reach the more rational persons
Autism Occurrence by MMR Vaccine Status Among US Children With Older Siblings With and Without Autism
Conclusions and Relevance
In this large sample of privately insured children with older siblings, receipt of the MMR vaccine was not associated with increased risk of ASD, regardless of whether older siblings had ASD. These findings indicate no harmful association between MMR vaccine receipt and ASD even among children already at higher risk for ASD.