You need to check on your Department of Motor Vehicles website for Georgia. In some states, both the vehicle and the driver must be insured. So your vehicle may have been insured but I am certain it was not insured for allowing a driver with a suspended license to drive the motor vehicle. Your brother, while licensed, was obligated to prevent your mother from driving. She needs to explain to the court just what occurred and your brother should be there. Further, your brother needs to be prepared to explain why he simply didn't stop for a while somewhere so he could sleep. This is most likely going to be a question the presiding judge will ask.