MMR vaccine

I am a mum who is pro-vaccination but I have been told by a relative that the MMR vaccine is a very strong vaccine and could cause autism / vaccine injury due to the presence of formaldehyde. I was told not to follow the vaccination schedule and delay giving the vaccine as long as possible. My relative told me that her 1.5 year old grandchild almost became autistic as he suddenly became unsociable / quietened down for a period of time after the vaccination. Any mummies encountered the same?