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Celebrity Sisters

Rooney and Kate Mara

Kate and Rooney Mara may be Hollywood stars, but their family history lies in sports. The girls are the great-granddaughters of Tim Mara, the founder of the New York Giants and Art Rooney, Sr., the founder of the Pittsburgh Steelers. Older sister Kate, 30, is best known for her role as Zoe Barnes in “House of Cards,” while younger sister Rooney, 28, earned an Academy Award nomination for her part in “The Girl with the Dragon Tattoo.” —XFINITY Entertainment Staff (Photo by Jemal Countess/Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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