Parents and third parties can never 'contract away' the right of children to be free from abuse and neglect.
Children are not pieces of property that can be rented, bought, or sold by parents or treatment programs of any nature.
Parents are always free to remove a child when there is any suspicion of abusive treatment or neglect.
In fact, a parent's failure to remove a child, or a relative's failure to report suspected child abuse or neglect, may leave the adult open for possible liability.
A relative may be able to petition for a writ of habeas corpus (Latin for 'bring the body forth').
This information is general in nature, and a lawyer should always be contacted for advice in any particular situation.
"In fact, a parent's failure to remove a child, or a relative's failure to report suspected child abuse or neglect, may leave the adult open for possible liability."
I think this is the most relevant point. If he is being mistreated - its the parents that will cop the blame not the institute from the sounds of it, however its the institute we should b focussing on