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

LONDON, ENGLAND - AUGUST 05: Gold medalists Serena Williams of the United States and Venus Williams of the United States celebrate during the medal ceremony for the Women's Doubles Tennis on Day 9 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 5, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)
Olympics Day 9 - Tennis
LONDON, ENGLAND - AUGUST 05: Gold medalists Serena Williams of the United States and Venus Williams of the United States celebrate during the medal ceremony for the Women's Doubles Tennis on Day 9 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 5, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)
DALLAS, TX - MAY 13: Taekwondo athletes and brother and sister, Diana Lopez and Steven Lopez pose for a portrait during the 2012 Team USA Media Summit on May 13, 2012 in Dallas, Texas. (Photo by Nick Laham/Getty Images)
2012 Team USA Media Summit
DALLAS, TX - MAY 13: Taekwondo athletes and brother and sister, Diana Lopez and Steven Lopez pose for a portrait during the 2012 Team USA Media Summit on May 13, 2012 in Dallas, Texas. (Photo by Nick Laham/Getty Images)
LONDON, ENGLAND - AUGUST 06: Tiago Splitter (C) of Brazil vies with Pau Gasol (L) and Marc Gasol of Spain during the Men's Basketball Preliminary Round match between Spain and Brazil on Day 10 of the London 2012 Olympic Games at Basketball Arena on August 6, 2012 in London, England. (Photo by Mark Ralston - IOPP Pool /Getty Images)
Olympics Day 10 - Basketball
LONDON, ENGLAND - AUGUST 06: Tiago Splitter (C) of Brazil vies with Pau Gasol (L) and Marc Gasol of Spain during the Men's Basketball Preliminary Round match between Spain and Brazil on Day 10 of the London 2012 Olympic Games at Basketball Arena on August 6, 2012 in London, England. (Photo by Mark Ralston - IOPP Pool /Getty Images)
LONDON, ENGLAND - JULY 28: Andy Murray and Jamie Murray of Great Britain reacts after a point against Alexander Peya and Jurgen Melzer of Austria during their Men's Doubles Tennis match on Day 1 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club in Wimbledon on July 28, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)
Olympics Day 1 - Tennis
LONDON, ENGLAND - JULY 28: Andy Murray and Jamie Murray of Great Britain reacts after a point against Alexander Peya and Jurgen Melzer of Austria during their Men's Doubles Tennis match on Day 1 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club in Wimbledon on July 28, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)
Maggie Steffens, Jessica Steffens
Steven Gluckstein, left, shakes hands with his brother Jeffery during a medal ceremony after the men's trampoline finals at the U.S. Olympic gymnastics trials in San Jose, Calif., Wednesday, June 27, 2012. Steven won the gold medal and Jeffery placed third. (AP Photo/Jae C. Hong)
Steven Gluckstein, Jeffery Gluckstein
Steven Gluckstein, left, shakes hands with his brother Jeffery during a medal ceremony after the men's trampoline finals at the U.S. Olympic gymnastics trials in San Jose, Calif., Wednesday, June 27, 2012. Steven won the gold medal and Jeffery placed third. (AP Photo/Jae C. Hong)
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)
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)
ADELAIDE, AUSTRALIA - MARCH 22: Cate Campbell and Bronte Cambell of Australia celebrate after competing in the Womens 50 Metre Freestyle Final during day eight of the Australian Olympic Swimming Trials at South Australian Aquatic & Leisure Centre on March 22, 2012 in Adelaide, Australia. (Photo by Morne de Klerk/Getty Images)
Australian Olympic Swimming Trials: Day 8
ADELAIDE, AUSTRALIA - MARCH 22: Cate Campbell and Bronte Cambell of Australia celebrate after competing in the Womens 50 Metre Freestyle Final during day eight of the Australian Olympic Swimming Trials at South Australian Aquatic & Leisure Centre on March 22, 2012 in Adelaide, Australia. (Photo by Morne de Klerk/Getty Images)
TOKYO, JAPAN - MAY 05: Rie Tanaka (C) poses with her younger brother Yusuke Tanaka (L) and older brother Kazuhito Tanaka as they are qualified for the Japan gymnastics team for the London 2012 Olympic Games after all the competition during day two of the 51st Artistic Gymnastics NHK Trophy at Yoyogi National Gymnasium on May 5, 2012 in Tokyo, Japan. (Photo by Kiyoshi Ota/Getty Images)
Artistic Gymnastics NHK Trophy - Day 2
TOKYO, JAPAN - MAY 05: Rie Tanaka (C) poses with her younger brother Yusuke Tanaka (L) and older brother Kazuhito Tanaka as they are qualified for the Japan gymnastics team for the London 2012 Olympic Games after all the competition during day two of the 51st Artistic Gymnastics NHK Trophy at Yoyogi National Gymnasium on May 5, 2012 in Tokyo, Japan. (Photo by Kiyoshi Ota/Getty Images)
In a photo, date unknown, provided by U.S. Sailing, Zach and Paige Railey sit in Miami. The Raileys have both qualified for the London Olympics. Zach Railey, 28, knows the drill. He made his Olympic debut at Beijing, winning the silver medal in the Finn class. Paige didn't make those Olympics. She flipped her boat in the trials and lost to Anna Tunnicliffe, who went on to win the gold medal in the Laser Radial class. (AP Photo/U.S. Sailing)
Zach Railey, Paige Railey
In a photo, date unknown, provided by U.S. Sailing, Zach and Paige Railey sit in Miami. The Raileys have both qualified for the London Olympics. Zach Railey, 28, knows the drill. He made his Olympic debut at Beijing, winning the silver medal in the Finn class. Paige didn't make those Olympics. She flipped her boat in the trials and lost to Anna Tunnicliffe, who went on to win the gold medal in the Laser Radial class. (AP Photo/U.S. Sailing)
Slovakia's Pavol Hochschorner, front, and Peter Hochschorner compete in the men's C2 canoe slalom final at the Shunyi Olympic Rowing and Canoeing Park at the Beijing 2008 Olympics in Beijing, Friday, Aug. 15, 2008. (AP Photo/Kirsty Wigglesworth)
Hochschorner Twins
Slovakia's Pavol Hochschorner, front, and Peter Hochschorner compete in the men's C2 canoe slalom final at the Shunyi Olympic Rowing and Canoeing Park at the Beijing 2008 Olympics in Beijing, Friday, Aug. 15, 2008. (AP Photo/Kirsty Wigglesworth)
GUADALAJARA, MEXICO - OCTOBER 19: Julia Reinprecht (L) and Katherine Reinprecht of the USA field hockey team leave the field after their victory over Mexico during the XVI Pan American Games Day Five on October 19, 2011 in Guadalajara, Mexico. (Photo by Scott Heavey/Getty Images)
XVI Pan American Games - Day 5
GUADALAJARA, MEXICO - OCTOBER 19: Julia Reinprecht (L) and Katherine Reinprecht of the USA field hockey team leave the field after their victory over Mexico during the XVI Pan American Games Day Five on October 19, 2011 in Guadalajara, Mexico. (Photo by Scott Heavey/Getty Images)
France's Steeve Guenot celebrates with fans after his gold medal match in the 66-kilogram greco-roman wrestling competition at the Beijing 2008 Olympics in Beijing Wednesday, Aug. 13, 2008. (AP Photo/Ed Wray)
France's Steeve Guenot celebrates with fans after his gold medal match in the 66-kilogram greco-roman wrestling competition at the Beijing 2008 Olympics in Beijing Wednesday, Aug. 13, 2008. (AP Photo/Ed Wray)
France's Steeve Guenot celebrates with fans after his gold medal match in the 66-kilogram greco-roman wrestling competition at the Beijing 2008 Olympics in Beijing Wednesday, Aug. 13, 2008. (AP Photo/Ed Wray)
TOKYO, JAPAN - MAY 24: Kenichi Yumoto (L) and his twin brother Shinichi Yumoto of Japan take part in the training session for the Japan Men's wrestling team for the London 2012 Olympic Games at the National Training Center on May 24, 2012 in Tokyo, Japan. (Photo by Kiyoshi Ota/Getty Images)
Japan Men's Wrestling Team Training Camp
TOKYO, JAPAN - MAY 24: Kenichi Yumoto (L) and his twin brother Shinichi Yumoto of Japan take part in the training session for the Japan Men's wrestling team for the London 2012 Olympic Games at the National Training Center on May 24, 2012 in Tokyo, Japan. (Photo by Kiyoshi Ota/Getty Images)
Cayman Island's Brett Fraser, right, is embraced by his brother Shaune after winning the men's swimming 200m freestyle at the Pan American Games in Guadalajara, Mexico, Tuesday, Oct. 18, 2011. Brett Fraser won the gold medal and his brother Shaune the silver one. (AP Photo/Silvia Izquierdo)
Brett Fraser, Shaune Fraser
Cayman Island's Brett Fraser, right, is embraced by his brother Shaune after winning the men's swimming 200m freestyle at the Pan American Games in Guadalajara, Mexico, Tuesday, Oct. 18, 2011. Brett Fraser won the gold medal and his brother Shaune the silver one. (AP Photo/Silvia Izquierdo)

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