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What’s the age difference between Venus and Serena Williams?

03:45

Marking the upcoming release of Tina Fey and Amy Poehler’s new comedy “Sisters,” this  week’s “Who Knew?” is all about sister trivia. So who better to help grapple with the questions than the Bella Twins, Nikki and Brie, who are professional wrestlers and stars of “Total Divas” as well as twin sisters?