I got banned and don't know why

I got banned from the server but I don't know for what reason or how long I will be banned.

 

it says that i was griefing creative, but i dont remember griefing anyone.

 

You griefed a bunch of ice on another player's creation, replacing it with red wool.

 

ohhh, that must have been my brother. he was playing on my account while i was installing mods for him on his minecraft on his computer. would it be possible to lift the ban and i could replace what he has done?

 

-.- your brother playing does not excuse you from griefing, if he actually played at all.
once i see the scope of the grief i'll decide what to do.