24 Sets of Siblings Competing at the Olympics

Country: USA
Sport: Tennis

Among the most recognizable pairs are Venus, 36, and Serena, 34, who mark their fifth Olympics at Rio this year. They're three-time doubles gold medalists winning in 2000, 2008, and 2012.

Country: Netherlands
Sport: Gymnastics

The Wevers twins, 24, didn't compete on the same team until 2014 at the European Championships due to injuries between them. "Everyone had seen us apart from each other at competitions so when we did stand there together, it felt very special," Lieke said in a documentary.

Country: Scotland
Sport: Marathon

2016 is the first Olympics for distance runners Derek, 27, and Callum, 24. Callum has a personal best of 2:10:52 while his brother's is 2:12:57.

Country: USA
Sport: Fencing

It's not the first time at the Olympics for Courtney, 25, nor Kelley, 28. Kelley competed in Beijing while both competed in London and were part of the bronze medal-winning team.

Country: Australia
Sport: Sailing

Will, 28, is a three-time world champion and no doubt an inspiration for his sister Jaime, 22. Of her brother, Jaime has said, "He's been on the circuit for a few years more than me, and has been such a huge help in every part of my sailing over the years, there is no way I would be at this stage without him."

Country: Northern Ireland
Sport: Rowing

Richard, 31, and Peter, 26, won silver together at the London Olympics in 2012 for the lightweight men's four. They're the first brothers to compete together in rowing since Greg and Jonny Searle, who took gold in the 1992 Barcelona Olympics.

Country: Great Britain
Sport: Tennis

Andy, 29, may have the bigger name in the family (the 2016 Wimbledon champion is ranked number two in the world and won an Olympic gold medal in 2012), but Jamie, 30, once ranked number one in the world for doubles and is a two-time Grand Slam winner. "We both know how to get the best out of each other," Jamie has said.

Country: Australia
Sport: Modern Pentathlon

Chloe, 23, and Max, 17, share their Olympic Athlete father, Daniel Esposito, for a coach. Daniel competed in the 1984 Los Angeles games. Of their training regimen, Chloe has said, "We're up early, like at 5 o'clock in the morning, and then finish say at 8 or 7 o'clock at night so it's a full-on day, like a full-time job."

Country: Australia
Sport: Judo

Nathan, 21, and Josh, 18, are the first pair of brothers to compete in Judo at the Olympics. It's a family sport: their mother, Kerrye, competed in the 1988 Seoul games where there father, Rob, was a judo coach.

Country: Australia
Sport: Swimming

Cate, 24, and Bronte, 22, already won gold in Rio on the same team for the women's 4x100m relay. "This was our dream, to do it together," Cate said in an interview, "It was almost taken for granted that if one went, the other would be going, too."

Country: Great Britain
Sport: Triathlon

The Brownlee family already has two Olympic medals from 2012: Alistair, 28, took home a gold medal while Jonny, 26, won bronze.

Country: Brazil
Sport: Rugby Sevens

Twins Felipe and Daniel, 22, were selected to represent their native Brazil just six months after returning from playing for a French team, Albi. "When will this dream stop? As long as there are opportunities, we will continue!" David said in an interview, "The journey won't stop here."