My wife and I adopted a male child

Sir/Madam, my wife and I adopted a male child a few years ago under Hindu act. Unfortunately the boy (now 15 yrs legally old) turned mentally disturbed, violent and disobedient 3 yrs ago. We needed to hospitalize him and call the Police as we didnt know how to handle him. He attacked us and broke many valuables. The mother buys him whatever he wants. He is angry now that we have hospitalised him and made him a mental patient and called the police on him. He is still minor. I've tried my best to encourage and support him. Occasionally he says he wants to leave us. However the Child welfare committee told us that if he leaves, he will have to stay in a govt home for orphans till he turns 18. My question is will he complain once he turns major that we did not let him go even though he wanted to? How do I make a legal submission to the govt/court that the child wants to leave us. (Ofcourse he will not leave)