P.S. IMO, this:
He was sober for 20 years I'm hoping and praying he can find his way again.
is Denial.
IMO you need to stop thinking about the 20 years. The 20 years is OVER, gone, water under the bridge. Live in the PRESENT moment. Ever notice how when a person who has any amount of sobriety under his or her belt drinks again, even just ONE BEER, they reset the "clock"? It all starts over as Day One. There is a reason for that. Because yesterday does not matter--we live in the Present Moment. Today, Right Now.