Biography
William John Kerr, 5th Marquess of Lothian, was born 13 March 1737 to William Henry Kerr, 4th Marquess of Lothian (1710-1775) and Louisa-Carolina Schomberg (1718-1778) and died 4 January 1815 of unspecified causes. He married Elizabeth Fortescue (1745-1780) 15 July 1762 in Ireland.
Children
| Name | Birth | Death | Joined with |
| William Kerr, 6th Marquess of Lothian (1763-1824) | 4 October 1763 | 27 April 1824 Richmond, London, England, United Kingdom | Harriet Hobart (1762-1805) Harriet Scott (1780-1833) |
| Elizabeth Kerr (1765-1822) | |||
| Charles Beauchamp Kerr (1775-1816) | |||
| Mark Robert Kerr (1776-1840) | 12 November 1776 | 9 September 1840 | Charlotte MacDonnell, 3rd Countess of Antrim (1779-1835) |
| Robert Kerr (1780-1843) | 14 September 1780 | 23 June 1843 | Mary Gilbert (bef1791-1861) |
| Mary Kerr (bef1773-1791) | |||
Footnotes (including sources)
| ‡ General |