So if my wife asks my sister about me, what should my sister say? I know this isn't a normal situation, and she admitted to my sister that she still loves me and care about me, but can't be with me because of who I am and that in 3 years time hopefully she and I can be friends. So it's clear she still has some degree of love for me even in her delusional state. In her mind, I'm the offender and the one who's done everything wrong.

Maybe just keep it short and generic like, "he's doing ok"? Or would it be good to say something more like "He hopes that you're healing and he's doing ok himself."