John Adams Sr. (1691-1761) was the father of John Adams Jr., second president of the United States, and grandfather of John Quincy Adams, the sixth president.
John Adams Sr. (February 8, 1691 – May 25, 1761) Adams married well, to Susanna Boylston, from a prominent family of scientists and medical doctors, in October 1734.
Adams died in 1761, at the age of 70, and his widow Susanna later married John Hall
Doug Wead, The raising of a president: the mothers and fathers of our nation's leaders, pp. 1, 6-7, 40-5-6 (Simon and Schuster, 2005). ISBN 978-0-7434-9726-8. Found online at Google Books. Accessed February 28, 2011.
Zachary Kent, John Adams: Creating a Nation: America's founding fathers, p. 13 (Enslow Publishers, 2004) ISBN 978-0-7660-2183-9. Found online at Google books. Accessed February 28, 2011.
It may be possible to confirm family relationships with John by comparing test results with other
carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: