For Elizabeth Hunter Vaughan
and her cousins (on Grandmother Knight's side).
John Adams' great grandfather was Josiah Chapin, who is also your 9th great grandfather. Josiah was born in England and came to America as a pioneer, settling in Worcester, Massachusetts, where he died in 1726. The relationship of President Adams to you is by marriage, because Josiah's daughter, Mary, was the first wife of Joseph Adams; Mary died after bearing two daughters, Mary and Abigail. Joseph then married Hannah Bass, and they had a lot of children: Joseph, John, Samuel, Josiah, Hannah, Ruth, and Bethia. After Hannah died, Joseph married Elizabeth Hobart, and they had a son, Caleb. Joseph raised ten children in his family.
So John Adams, the second president of the United States, is descended from Joseph's second wife, Hannah Bass. You are descended from Joseph's first wife, Mary Chapin.
John Adams' son, John Quincy, was the 6th president of the United States.