I live by the standard that your account should never be shared, no matter if it was your brother. I sincerely doubt, in the time your brother or friend was using your account for, that they were able to install the hacks, use the account, specifically go onto that server, use them and then in 5 minutes later or sometime later that day/month/week, they say OH! IT was my brother/friend. I think that the account responsibility should go to the owner of the account, and they should be held accountable for who ever was using their account at the time. AS THEY were the individual who gave access to the others to use it, so THEY must be held responsible, because in the end, it's their own "avatar/character"