Oh, and it's a Catholic church wedding.

I have a maid of honor, matron of honor, bridesmaid, and bridesman (my guy best friend) and my fiance has 2 best men and 2 groomsmen. How do I have my bridesman walk down the aisle? Since this will be a Catholic church wedding, I can't exactly have him arm-in-arm with a groomsman. One idea that I had was to have him walk down with my mother and have one of the groomsmen walk down with my fiance's mother.
My fiance has a sister, but he doesn't want her on his side (they don't get along too well), and I don't think he has any other close female friends. Plus, if we add one to his side, I'll have to add one to my side and the only person I can really think of is my cousin, but she doesn't seem to really care about this wedding.
I would LOVE suggestions!