1. Wrong forum. If you want Blizzard to do anything regarding connections go to Tech Support.
2. If you got hit a by a temp ban all you can do is wait it out. Blizzard won't lift or remove a temp ban for any reason.
3. Teach your brother what do's and don't's are on b.net. If he won't listen restrict his access to your system.
Venture to the Realms Beyond to get off the beaten path.