If his previous DUI was within 7 years, he will considered a second time offender. This changes the amount of jail time (minimum of 120 days) he faces, the fines, and other sanctions. If he received the second DUI while he was required to have an interlock or he did not have a license, he will face an Aggravated DUI which is a felony. Your brother needs the help of an experienced attorney. Most attorneys on this site offer free initial consultations. Set one up. Best of luck!