Hope she'll see some reason soon. She's damaging her kids. And no matter how much personal problems you have with an ex, kids are entitled to see both parents, and both sides of the family. (Unless there is criminal activity in such a way that it is harming the kid)
Depriving a little autistic kid from contact with the few people he lets into his life is even more cruel.
She is his Mum, so she should be part of his life, but wow, she deserves no more than just the bare minimum.
I would not mind her suffering a nasty fracture with complications and hospitalisation for a few weeks. So that Dad can take his place back in the life of his kids.