If it were me, I would do everything within my power to separate all finances. Marriage to an alcoholic was THE worst financial move I ever made. If you cosigned loans then his first priority should be to use his inheritance to pay off that loan and absolve you from the obligation. Anything joint should be payed off and closed/refi'd.. etc.
If his mother passed then sell that house you co-signed on, kick the brother out if he's living in it. Get out from under that ASAP.
I just don't get it when anyone expects to be taken care of. What is up with that?!?!?