Drums, they're like a drug man. I get strong urges to play drums while I'm at school and I have to wait 6 hours to play them again.
YOur brother shouldn't deny the time you need on the drums. This may seem a less honorable way out, but if reasoning doesn't work, see if your parents can help with a solution.
Or you can always beat him up until he lets you play drums, if your the bigger brother. :wink: