Originally Posted by
BoxinRotz 
Every time I have mentioned a treatment plan he has said, I have the tools to do this myself but I do believe that his tools have rusted from not being used. I don't believe for one second that he can do this alone and on his own because this is not the first time he has said, I can do this by myself.
Alcoholism is a progressive disease. The tools that got him sober 20 years ago are now too small and light-duty to the job now (even if they weren't rusted).
At this point, he will need some kind of rehab followed by a support group.
Even then, his odds are slim. You need to build boundaries that will protect you if he fails.