Answer
Nelson Rockefeller was the son of John D. Rockefeller Jr. and Abby Aldrich Rockefeller. John D. Rockefeller Jr. was the only son of John D. Rockefeller, Sr., the founder of the Standard Oil Company and the richest man in the world at the time of his death in 1937. Abby Aldrich Rockefeller was the daughter of Senator Nelson Aldrich of Rhode Island and a descendant of the Mayflower Pilgrims.