Does your son have an advocate or guardian ad litem?
Sounds like he could use an objective person speaking up for his rights. I'm not sure what your son's special needs are, but I'd reach out to some organizations to see if you can find him someone to speak up to keep his current caretaker in place.
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson
