Actually, no. Under threats of divorce from his wife, and with other health problems, he seems to have given it up, for now.
He’s pretty decent when clean and sober, but he’s psychologically needy... I’d say the odds are below 50-50 that it will last.
One of the hardest habits to kick bar none. Your sister needs to honestly think about getting out while the getting is good. She’s entitled to a decent less stressful life.
Threats don’t work. He has to want to get and stay sober. That’s up to him.
Believe me, I’ve been there with an alcoholic girlfriend.
Hard to do. Prayers.