From Wikipedia
http://en.wikipedia.org/wiki/Genealo...n ited_States
Presidents related to British royalty
George Washington (descendant of Edward III of England)
Thomas Jefferson (descendant of Edward III of England)
James Madison (descendant of Edward I of England)
James Monroe (descendant of Edward III of England)
John Quincy Adams (descendant of Edward III of England)
William Henry Harrison and his grandson, Benjamin Harrison (descendants of Edward I of England)
Zachary Taylor (descendant of Edward I of England)
Franklin Pierce (descendant of Henry I of England)
Rutherford Hayes (descendant of William I of Scotland and William the Conqueror)
Grover Cleveland (descendant of Edward I of England)
Theodore Roosevelt (descendant of James I of Scotland and Edward III of England)
William Taft (descendant of Edward III of England)
Warren Harding (descendant of Henry II of England)
Calvin Coolidge (descendant of Edward I of England)
Herbert Hoover (descendant of Edward III of England)
Franklin Roosevelt (descendant of James II of Scotland)
Harry S. Truman (descendant of Robert III of Scotland)
Richard Nixon (descendant of Henry II of England)
Gerald Ford (descendant of Edward I of England)
Jimmy Carter (descendant of Edward III of England)
George H. W. Bush and his son, George W. Bush (descendants of Edward I of England and Robert II of Scotland
Barack Obama (descendant of Edward I of England and William the Lion of Scotland)
According to a chart published by twelve-year-old student BridgeAnne d'Avignon, all U.S. presidents except Martin Van Buren can trace descent from King John of England.
As a result, all presidents except Van Buren are
direct descendants of Alfred the Great and William the Conqueror.
HM Queen Elizabeth II is among the closest living relatives of George Washington, through their descent from Augustine Warner, Jr., Speaker of the Virginia House of Burgesses. His daughter Mildred was the grandmother of Washington, while his daughter Mary is an ancestor of the Queen's mother, Elizabeth Bowes-Lyon.