Im really sorry to hear that guys. It is an extremely sad situation, and many people do not realise the greatness of it.. let me tell you though, if their doctor has said that there is no cure.. he;s worng, there is a cure for Autism.
Type in Google "Son-rise The miracle of Love" and you should get their website.. go through it, and maybe you can even contact them
Hope they get better soon ia
By the way.. how old are they ?