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Secret Celebrity Cousins

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Tom Cruise and William Mapother

Tom Cruise and "Lost" actor William Mapother's fathers are brothers, making the actors first cousins. Cruise was born Thomas Cruise Mapother IV, but changed his name early in his career. Mapother has appeared in five of Cruise's films, including "Mission: Impossible II" and "Magnolia." —XFINITY Entertainment Staff (Photos by Larry Busacca, Frederick M. Brown/Getty Images)

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

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