sibling rivalry

The Brothers Harbaugh: Tuesday January 29, 1-2 p.m.

With Sunday's Super Bowl presenting an historic fraternal faceoff -- Coach John Harbaugh's Baltimore Ravens versus Coach Jim Harbaugh's San Francisco 49ers -- we take a look at famous brothers, from the Booths to the Van Goghs to the Marx Brothers, with George Howe Colt, author of Brothers, a memoir of his siblings and iconic brothers through history.