Need Some Wedding Party Help

Hello wedditors! At my wedding my fiance and I have decided to each have 4 attendants. Each 3 friends and a sibling. Problem is I have two siblings. What do you recommend I ask my brother to do?

** Other info: -One of my attendants is a 'bridesman' and the others are bridesmaids, my fiance has all groomsmen -My brother is 3 years younger and I am not that close with him since I moved away 4ish years ago -He doesn't like standing up in front of people, but we want to include him somehow