Need proof that athletic talent runs in the family? There are at least 30 sets of siblings competing in the Rio Olympics together, including a handful of twins and triplets.
Meet 61 brothers and sisters bringing family dominance to the Summer Games:
Team USA's Venus and Serena Williams were knocked out of the tennis doubles competition in a shocking upset, dashing the duo's hopes for a fourth Olympic gold. Serena is still vying for the gold medal in women's singles, however.
Source: NBC Olympics
Fencers Kelley Hurley (left) and younger sister Courtney were the first set of siblings to qualify for US Olympic team in 2016. Rio is their second time competing at the Olympics together.
Source: USA Today
Estonian marathon runners Leila, Liina, and Lily Luik will make history as the first Olympic triplets to compete together.
Fun fact: The sisters, now 30, only started running seriously at age 24.
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