Top 20 sibling rivalries in sports . For the first time , two sibling coaches will face-off in a major sports matchup last month . John Harbaugh and Jim have played down the notion of any rivalry . Brother-versus-brother is a common theme from the the `` Harbowl to network TV .
For the first time , two sibling coaches will face-off in a major sports matchup last month . John Harbaugh and Jim have played down the notion of any rivalry . Brother-versus-brother is a common theme from the the `` Harbowl to network TV .