Brother as bridesmaid??

Okay girls! So I am extremely particular about things, and that includes having an even number of people standing up on my side and on his side during our wedding. Some people are fine with uneven people, but that's non-negotiable for me. With that being said, my fiancé has 4 groomsman, and I only have 2 bridesmaids. (2 of mine backed out) However, I would love for my brother to be in my wedding too. Him and my fiancé are not close so it would make sense AND even things out for him to stand on my side by the girls. (That would make 3 people on each side). My mom says it's totally weird, but I know someone else who did it and it worked (guy was gay though, not sure if that changes things). My brother is a manly man but doesn't care either way. Thoughts??