How did what I said, contradict what you are saying? There is simply no way you can make someone stop drinking, unless they're willing to do so.
With that said, there are many who are court ordered to treatment, who accepted they had a problem, and wanted to quit. The two are not mutually exclusive (and the threat of prison time is also a great motivator).
But they have to buy into wanting to quit somewhere along the way, or it has no chance of working.
I do agree that quitting forever is the goal, but quitting for just a week would be an accomplishment for many.
Worth noting - unfortunately, your family history is far from unique.