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Nature vs Nurture
Venus and Serena Williams, Phil and Gary Neville, Yaya and Kolo Toure, but why are there so many sporting siblings?
Is it in your DNA? Is it down to hard work? Or is it something else? Sportshour鈥檚 Rachael Rhodes has been finding out about new research into the area and hearing from MMA legend Ken Shamrock.
Image: Ken Shamrock during a portrait shoot in Las Vegas, Nevada (Photo by Kevin Lynch/Zuffa LLC/Zuffa LLC via Getty Images).
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