Parole? So he was in prison, not jail? Then there's a lot more to this story than "a first time offender taking a joyride in his girlfriend's car."
Generally speaking, the answer to the question "Can my brother get off of parole early" is going to be "No, he can't." His parole officer may be able to help him find assistance for housing or job placement.
Once he has a job, a stable, appropriate place to live, has paid off his court assessments, has consistently passed any required drug tests, and has otherwise demonstrated the ability to succeed on parole, he will be in a much better position to try to get an early discharge.

