Godparent dilemma

I have chosen my youngest brother to be my daughter's Godfather. I feel bad because I am especially close with my other brother however he is an atheist and I can't exactly have him stand up during my daughter's baptism and say that he promises 2 help her learn about God which is why I chose my other brother. I want to do something special for my brother who is not the Godfather... But I don't know what and I need suggestions. I know he will understand why he isn't The Godfather but I don't want any hard feelings.