Paulos, you'll quit when you want to quit, and not before, regardless of your issues at home. If living at home is detrimental to your sobriety, there are other options. Have you sat down with your mother and discussed what's going on in your head lately?
I know you can get sober again, because you've done it before. Last time you built up some serious sober time, what did you do to deal with the family drama?