Gosh, Simply_Simon,
If I didn't know better I'd swear this was my friend who made this post! You have described the exact situation which my dear friend is dealing with right now. I have been trying to help him come to a conclusion, and the only thing that seems left to do is for him to move out. The only problem is that he is not in the financial position to do so right now either. (He's 26, by the way). I have dealt with alcoholics, (my ex-husband was one) and the thing that helped me the most was distancing myself away from him. (I know it's harder to do when it's your dad). I also attended a few al-anon meetings in my area, but found them to not be very beneficial, for me at least. You may feel differently. If you aren't familiar with these meetings they are basically meetings for people who have alcoholics in their lives. They kind of go by the 12 step rule, much like AA does. If anything, they are good for the support you can find from others in similiar situations. I found more support at a depression group I went to weekly. I wish I had more of a solution for you, but I just wanted you to know that I understand, and I'm wishing you well.
Sujin