2013San Francisco 49ers head coach Jim Harbaugh (R) and Baltimore Ravens head coach John Harbaugh
While Baltimore Ravens head coach John Harbaugh and his brother Jim, the head coach of the San Francisco 49ers, will be the first brothers to oppose each other in the Super Bowl, plenty of other families have fought it out in the sports world.
Here's our pick of the best:
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Venus and Serena Williams (Tennis)
Serena Williams and sister Venus williams at the 2009 Wimbledon singles finalBoth are great players in their own right, with Serena winning 15 grand slam singles titles and Venus, the older of the two, collecting seven.
The pair squared off in eight grand slam finals, including four in a row, with Serena winning six and Venus two. In 2002 and 2003, the sistersRead More »from Sport’s greatest sibling rivalries