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Rooney and Kate Mara

Any given Sunday, the Mara sisters have two teams to root for. Their paternal great-grandfather, Tim Mara, founded the New York Giants and the Mara family still owns the team today. On their mother's side, their maternal great-grandfather was football icon Art Rooney, the founder of the Pittsburgh Steelers. Their great-uncle, Dan Rooney, is the chairman of the team today. Despite the family success, the Mara sisters are hardworking, critically acclaimed actresses.

Image Source: Getty / Jeff Kravitz
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