Smith was the younger brother of Joseph Smith Sr., uncle of Joseph Smith and Hyrum Smith, father of George A. Smith, grandfather of John Henry Smith, and great-grandfather of George Albert Smith.
John Smith war der jüngere Bruder von Joseph Smith, Sr., Onkel von Joseph Smith und Hyrum Smith, Vater von George A. Smith, Großvater von John Henry Smith und Urgroßvater von George Albert Smith.