There is help
Dear Friend,
I had the same situation with my mother. My sister is an alcoholic and my mother economicaly support her since I can remember. I would talked to her and the best times she will listen and stop for a day or too, but once my sister called, the check was one the way. Sometimes my mother called her to give her the check.
I asked my mother to go to an Alanon meeting with me, and we found a pamphlet called A Guide for the family of the alcoholic. After the meeting, we went to a restaurant and we read it together and to my surprise it worked! My mother is reading in a daily basis and she is determine to stop contributing to the alcoholism and let my sister face the consequences of her actions.
My prayers are with you and your family.
AlFriend