I feel like the situation with my family is so different than my version of reality that sometimes I start to think that maybe I'm just crazy!
Welcome to the Forum, MzSister.
First, I want to support your decision absolutely to limit your brother's access to your son.
I quoted the above, because I grew up with an alcoholic father, and I knew something was wrong, but no one would talk about it. No one. And I did feel crazy.
If your brother is suffering from jaundice, that is just awful to watch. My father died from cirrhosis, and it is terrible.
Good on you for going to AlAnon, and learning how to protect yourself and your son.
Live in your reality, it is the only one that matters.
Beth