Joseph Fielding Smith, Jr. was born 18 December 1913 in Salt Lake City, Salt Lake County, Utah, United States to Joseph Fielding Smith (1876-1972) and Ethel Georgina Reynolds (1889-1937) and died 25 August 1974 North Rim, Coconino County, Arizona, United States of unspecified causes. She married Zella Farr (1914-1996) 16 May 1933 in Evanston, Uinta County, Wyoming.
Children
| Name | Birth | Death | Joined with |
| Lewis Farr Smith (1946-2014) | |||
Siblings
| Name | Birth | Death | Joined with |
| Josephine Smith (1902-1995) | |||
| Julina Smith (1906-1997) | |||
| Name | Birth | Death | Joined with |
| Emily Smith (1909-1994) | |||
| Naomi Smith (1910-1979) | 16 November 1910 Salt Lake City, Salt Lake County, Utah, United States | 15 October 1979 Salt Lake City, Salt Lake County, Utah, United States | Hoyt William Brewster (1910-1988) |
| Lois Smith (1912-1981) | |||
| Joseph Fielding Smith (1913-1974) | 18 December 1913 Salt Lake City, Salt Lake County, Utah, United States | 25 August 1974 North Rim, Coconino County, Arizona, United States | Zella Farr (1914-1996) |
| Lewis Warren Smith (1918-1944) | |||
| George Reynolds Smith (1921-1982) | |||
| Amelia Smith (1916-2005) | 21 June 1916 Salt Lake City, Salt Lake County, Utah | 22 September 2005 Salt Lake City, Salt Lake County, Utah | Bruce Redd McConkie (1915-1985) |