You don't give many details ( and understandably so ) but heres my twopence worth with what youv given us to go on .
Firstly , you put kids in care because you cant cope , when youv exhausted every other avenue , when its in the childs interest to be moved away from the home environment , NOT " to teach them a lesson "
Secondly Its interesting that you say his behaviour is so bad , you could of give lots of examples of this I suppose , yetyou chose to mention him stealing your beer !!!
Have a look at yourself mate ,the kids mixed up he needs you to help him , guide him , show him love