When I first began to look at what I was doing and trying to draw the line with enabling it helped me to look at things this way.....
Are the things I am doing making it easier for him to keep drinking? If the answer was yes (and it usually was) then I stopped doing it.
Drinking results in certain consequences (no job, no place to live, no phone, lower standards of hygiene). If we mitigate those consequences then we make it easier for them to keep drinking. The alcoholic in my life was my husband. I can't imagine the heartbreak of being a parent of an alcoholic. I agree with the suggestion of al-anon. It helped me a lot.