yeah, I'm with all the other recovered alcoholics posting on this thread.
"Lapse/Relapse" - it's all just drinking.
I'd say stay out of it, though. It's his sinking ship that he's gonna have to bail out, bucketful by bucketful.
Let the MAT team do their thing. They are trained in dealing with individual issues.
I'm going to also say that parents can make things far far worse by trying to discuss it...upbringing is oftentimes part of the whole package deal with substance abuse. You're too close to this and emotions can run very strong.
Anger and shame are huge for alcoholics, and no one can unwittingly say the wrong thing like a parent. My mother could bring out the very worst in me.