Aspergers and selective mutism

Hi, everyone

Not sure how this all works yet as new to the site. 

I have 4 Children all boys from 21 - 12, two of which are likely to be getting a diagnosis very soon for Aspergers. I have already been through the diagnosis process once for my now 19 year old, but they felt he was borderline so could not do a diagnosis, now however as he as got older, they have decided they want to re assess as they feel he is on the spectrum. 

I also have a 14 year old, who is almost at the end of diagnosis. I have done alot of online research on Autismn and have also learned through my own experiences of coping with different situations, but i must say i am struggling slightly with my 14 year old who has selective mutism also and am wondering if anyone else has a child with selective mutism, that can share any pointers.

Thank you xx