M.L.
The organization you need to be interested in is Al-Anon. It's specifically for the family members and friends of the alcoholic. Not only do you get to know people in the same boat as you, but you also get to learn how to handle typical alcoholic behavior.
For instance, it isn't unusual for an alcoholic, when confronted, to be defensive ("You don't understand!"), denying ("I'm not an addict like my mother!"), and even counter-accusatory ("Look at the problems YOU have!"). It's good to know there are ways to handle this and other challenges.
Some people function well - they do their jobs, pay their bills, etc. - but they are still addicted to liquor. A person who says, "Oh, I can take it or leave it alone," but who, when it's available, always takes it, has a drinking problem.