He's got 8 months clean and is working on his recovery, so maybe try just having a fun weekend without the "how are you REALLY doing?" kind of conversations (I was so guilty of those *sigh*) or if the pending divorce makes "fun" a bit of a stretch, maybe take a family picnic someplace nice or go see a movie or anything that you can enjoy with him that isn't just about recovery or his pending divorce.
Just my thoughts and whatever you decide, I hope you have a wonderful time with him.
Hugs