I've been told I should probably show more interest in his sobriety.
After talking with Jennifer about it, she said it would be acceptable for me to get him a gift and card to help celebrate the fact he's been nearly 1 month sober. I told her I could get him a tie and maybe even a gift card to his favorite place (Subway) and she really liked my choices of gifts. So, I got a Chaps tie at Gordmans for $7.99 and a $10 gift card to Subway.