Millions of Americans can tie their roots back to the original Thanksgiving participants. So it is no surprise that eight past American Presidents also share family trees with these Pilgrims.     Notable descendants of John Howland: • George Herbert Walker Bush, 41st President of the United States • George Walker Bush, 43rd President of the United States • Edith Carrow, First Lady and wife of Theodore Roosevelt • Ralph Waldo Emerson, American Essayist, Author, and Poet   Notable descendants of Isaac Allerton: • Zachary Taylor, 12th President of the United States • Franklin Delano Roosevelt, 32nd President of the United States   Notable descendants of Richard Warren: • Ulysses S. Grant, 18th President of the United States • Franklin Delano Roosevelt, 32nd President of the United States • Laura Ingalls Wilder, American Writer   Notable descendants of John Alden: • John Adams, 2nd President of the United States • John Quincy Adams, 6th President of the United States   Notable descendants of John Billington: • James Abram Garfield, 20th President of the United States   for a Free Trial to Ancestry.com