For people who are even further gone than "unchurched", a C.S. Lewis anthology is a good gift - you're slipping them "Mere Christianity" in a stealth package. My brother is slowly but surely coming around - when I found out that he told my husband they were praying for me during surgery, I almost had a heart attack & had to stay on.
This is wonderful news, for you of course, as well. You must be doing well to be up and about. Blessings to you. And blessings to your brother, and the Spirit continues to pull him close.....
For fun, I also liked reading The Screwtape Letters
; and I just finished, a few weeks or so again, The Problem with Pain, another great Lewis book. For Christmas, I sent my daughter the Chronicles of Narnia, a one-book bound classic. I've read her and my other daughters parts of a couple books, I'm hoping she'll enjoy reading the rest (although I have not, as yet).