My SIL has a DS who will be 2 in April. My MIL(and other members of the family) are starting to get concerned that he is not speaking yet. He say's some words (mum, dad), but they are hard to make out. I know at this stage he should be talking much more than this, but there are some other things which are really concerning me.

He does not interact with other children, or with other people. Just likes to play by himself. Also, he flaps his arms when excited and likes to spin things - constantly. I have also noticed him grinding his teeth (almost looks like he is smiling, but when you get close, you can hear the teeth being mashed together). The more research I do, the more I'm convinced he has a form of autism.

My relationship with my SIL is not great and she is of the opinion that 'there is nothing wrong with my son!!!!', and won't get him assessed. I would love to believe her, but my sister has a son 1 month younger and he is much more interactive with others, speaks (alot!!), and still seems to be developing.

I would appreciate anyones comments/thoughts/experiences.