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Ross James, Grant James

In this May 7, 2012, shows American Olympic rowers Ross James, left, and his twin brother, Grant James, right, pose next to an Olympic flag at the rowing office in Oakland, Calif. Both will be competing in the London Olympics. (AP Photo/Paul Sakuma)

Sibling rivalry at the Olympics

The competition is already fierce as Olympic athletes strive for a gold medal, but the heat intensifies when athletes’ siblings are thrown into the mix. Whether they’re teammates, training partners, or in the midst of an intense rivalry, these Olympic siblings from all over the world will push each other to perform their best this year for country and family pride. --By Paul Rosales and Carla Thorpe, Yahoo! Sports