There isn't anything you can do about their drinking. You simply do not have that power.
God, grant me the serenity to accept the things I cannot change,
The courage to change the things I can,
And the wisdom to know the difference.
I often feel lost when I'm afraid to let things happen without trying to control the outcome for me or someone else. You do what is right for you. 'The next right thing.' It was and is a powerful tool for me. You can do small things that are right for you without knowing where it is taking you. You can make a mistake or change your mind. You can do something, or nothing at all, without knowing the outcome and that is OK. Sometimes my 'next right thing' is kind of a big decision and sometimes it is something rather small depending on the circumstances.
Do you have a feeling for what the next right thing for you might be?