My parents do foster care. A few of their foster daughters have told me that they have been to programs like this. One told me that she slept in a shelter she built (like a lean-to) even in the winter and went in the woods like bears. She, and another one who went through a similar program, seemed initially to have benefited but things later deteriorated. I wonder if these programs can come up with any studies showing long term benefits. I couldn't believe the state sent these children to a program like that. They aren't criminals and needed support (that they lacked from their parents to begin with) rather than punishment. Another went to a program that seemed a little better. It was after she spent time with my parents and she called my parents a few times and told them she was enjoying things and especially liked playing volleyball. Her version seemed significantly different than the other girls and she attended intensive therapy sessions.
Would any of the relatives be willing to host this child (like a foreign exchange student or a foster child)? Sometimes, parents don't want to admit that another family member's perspective or assistance could make more difference than their own and would prefer to trust the "professionals." But, I would argue that she should trust him with her family members before some strangers who are pretty much isolating him kind of like a cult. If he and his mother could get into family counseling and work on their relationship while they aren't having daily confrontations with him, they might significantly improve their relationship. If things are going that badly, what would the mother have to lose? She would be saving a ton of money.