Why hasn't he worked in 6 months?
No you can't make him get a job--but you can stop supporting him. If he is able--he should work. Do you work to earn your money that is paying for all the stuff he wants? If so, he has decided you, like his family, will support him and he does not need to get off his behind and support himself.
Sorry--been down this road and it can be an ugly road when someone suddenly thinks they do not have to contribute to the financial welfare of the home and is perfectly happy letting the other person do everything. This speaks volumes to me.