The children of Joseph Smith, Jr., the founder of the Latter Day Saint movement, and his wife Emma Smith, are historically significant because of their roles in establishing and leading the Reorganized Church of Jesus Christ of Latter Day Saints (now called the Community of Christ). Although Joseph Smith, Jr. publicly condemned polygamy, the predominant view among secular and religious historians is that Smith had polygamous "spiritual" marriages to many women; however, no children of these women have ever been proven to be Smith's. There is ongoing genetic research to see if any of the children that have been alleged as Smith's have his genetic markers. However, all of the tests have been negative, and some of the potential candidates have been ruled out. Not all of the proposed children can be tested with current technology because Y-DNA genetic testing for non-male lines is not possible.
| Child | Lifespan | Notes |
|---|---|---|
| Alvin Smith | June 15, 1828 – June 15, 1828 | |
| Thaddeus Smith | April 30, 1831 – April 30, 1831 | Twin of Louisa, premature |
| Louisa Smith | April 30, 1831 – April 30, 1831 | Twin of Thaddeus, premature |
| Joseph Smith* | May 1, 1831 – May 10, 1831 | *Adopted. Twin of Julia, birth son of Julia Clapp Murdock and John Murdock who upon his wife's death in childbirth gave the infants to the Smith's for adoption |
| Julia Murdock Smith* | May 1, 1831 – September 12, 1880 | *Adopted. Twin of Joseph, birth son of Julia Clapp Murdock and John Murdock |
| Joseph Smith III | November 6, 1832 – December 10, 1914 | Prophet-President of the Reorganized Church of Jesus Christ of Latter Day Saints (RLDS), opponent of polygamy |
| Frederick Granger Williams Smith | June 29, 1836 – April 13, 1862 | |
| Alexander Hale Smith | June 2, 1838 – 1909 | Senior leader of the RLDS Church, opponent of polygamy |
| David Hyrum Smith | November 17, 1844 – 1904 | born after Smith's death, active in the RLDS Church, opponent of polygamy |
No children of Smith's alleged polygamous relationships has been shown, to a scholarly consensus, to have been Smith's genetic offspring. However, Wilhelm Ritter von Wymetal, a "vitriolic anti-Mormon journalist", recorded in an 1886 interview with Sarah Pratt that Smith had John C. Bennett, a medical doctor, always on hand when anything happened. Although repeated by a Bennett biographer in 1971, the merits of this allegation have not yet received significant scholarly examination either by Mormon or secular scholars.
The following table lists some of the children born to Smith's alleged polygamous wives as well as those ruled out by genetic testing:
| Child | Date of birth | Mother | Father | DNA testing status | DNA testing result | Notes |
|---|---|---|---|---|---|---|
| Oliver Buell | 1838 – 39 | Presendia Huntington Buell | Norman Buell | Complete (November 2007) | Negative | Historian Fawn Brodie was certain Buell was a polygamous son of Joseph Smith. |
| John Reed Hancock | April 19, 1841 | Clarissa Reed Hancock | Levi Hancock | Incomplete | ? | Only anecdotal evidence that Clarissa Reed Hancock was a plural wife of Joseph Smith. |
| Mosiah Hancock | ? | Clarissa Reed Hancock | Levi Hancock | Complete (November 2007) | Negative | Only anecdotal evidence that Clarissa Reed Hancock was a plural wife of Joseph Smith. |
| Frank Henry Hyde | January 23, 1845, 1846? | Marinda Johnson Hyde | Orson Hyde | Incomplete | ? | |
| Orson Washington Hyde | November 9, 1843 | Marinda Johnson Hyde | Orson Hyde | Not possible (died in infancy) | ? | |
| Zebulon Jacobs | January 2, 1842 | Zina Huntington Jacobs | Henry Jacobs | Complete (May 2005) | Negative | |
| Algernon Lightner | March 22, 1842 | Mary Elizabeth Rollins Lightner | Adam Lightner | Not possible (died in infancy) | ? | |
| Josephine Rosetta Lyon | February 8, 1844 | Sylvia Porter Sessions Lyon | Windsor Lyon | Incomplete | ? | Mother told her on deathbed that Josephine was Smith's daughter. |
| Moroni Pratt | December 7, 1844 | Mary Ann Frost Pratt | Parley P. Pratt | Complete (May 2005) | Negative |