My sister and brother in law let his brother come stay with them for about two weeks. He was O so serious and doing so good. Stole from them then left. Then called and begged for a bus ticket which they bough and sent to him for $80 (they sent the ticket, not the money). He did not show.
They knew it was going to happen but his other brother was a substance absuer and committed suicide so they wanted to give him a chance. You said he feels the need to prove himself for a bit before he comes to stay w/you. Why not give him the chance to do that for himself?
Good Luck and God Bless!