I like the idea of the one way ticket to nowhere.
I also like the idea of the AA literature.
BUT, for right now I wouldn't do anything to him. He knows you want the child. He uses it to get what he wants from you and if you don't play nice he will just come and take him. - and no he doesnt care and doesn't want him - the child is nothing more than a pawn for him.
His trial has to be coming up soon. Document everything like everyone on here has said - I like HW suggestion to be sure and video everything at Christmas I hope brother brings booze in tow - making sure dates are stamped on the video or pictures would be helpful.
You are a wonderful person - I do believe in the end you will get what is best which is custody.