If you show up on your court date take along a copy of your DMV report to show it is clean along with the documentation about your brother's situation. While this is still not a reason for speeding they will normally reduce the fine and may allow traffic school so this does not increase your insurance.
Since many Virginia courts now allow Online Traffic School you may be able to avoid court altogether by calling the clerk of court to see if you are eligible. While you still pay the full fine you avoid the court time. Here is a link for more information
Virginia Traffic School