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The New England Historic Genealogical Society said Mr Obama's mother, Stanley Ann Dunham, and Mr Brown's mother, Judith Ann Rugg, both descend from Richard Singletary of Haverhill, Massachusetts.

In 2008, the society discovered that Mr Obama is related to seven prior presidents, including George H. W. Bush, George W. Bush, Jimmy Carter, Gerald Ford, Lyndon Johnson, Harry S. Truman and James Madison. They also learned he was related to Brad Pitt, the Hollywood actor.

The genealogical chart shows that Mr Obama descends from Richard's eldest son, Jonathan Singletary. He later changed his surname to Dunham. Mr Brown, meanwhile, descends from Jonathan's brother, Nathaniel Singletary.

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