George Washington and Robert E. Lee
George Washington helped the United States come together during the American Revolution, but his descendants tried to tear it apart again. The daughter of the first president’s adopted son, George Washington Parke Custis, married Confederate commander Robert E. Lee.
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George Washington and Napoleon Bonaparte
And if you needed any more proof than that, leadership really does run in the Washington family. The president’s great-grandniece married Napoleon Bonaparte’s nephew Achille Murat, who lived in Florida and fought in the Second Seminole War.
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Queen Elizabeth II and Prince Philip
Of course, this royal couple has been married for more than 70 years, but they had family ties long before tying the knot. Queen Victoria is the great-great-grandmother of both of them, making them third cousins.