John Potter Maddox was born 6 January 1789 in Ealing, Middlesex, England, United Kingdom to George Maddox and Sarah ? and died 1856 Brentford, Middlesex, England, United Kingdom of unspecified causes. He married Jane Francis (1790-1870) 19 April 1807 in Hanwell, Middlesex, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| George Maddox (1812-) | |||
| Eliza Maddox (1815-) | |||
| Eliza Maddox (1816-) | |||
| Jane Maddox (1818-1896) | |||
| John Maddox (1820-) | |||
| William Maddox (1823-) | |||
| Caroline Maddox (1825-) | 6 February 1825 Isleworth, Middlesex, England, United Kingdom | John Shaw John Sedgwick (c1824-1890) | |
| Rosina Maddox (1827-) | |||
| Joseph Maddox (1830-) | |||
| Thomas Maddox (1832-) | |||
| Emma Maddox (1833-1913) | |||
| Sarah Maddox (1836-) | |||