William Kerr, 3rd Marquess of Lothian British politician (1690–1767) Parents Lady Jane Campbell William Kerr, 2nd Marquess of Lothian Children unknown daughter Kerr William Kerr, 4th Marquess of Lothian unknown son Kerr Lord Robert Kerr Siblings Lady Elizabeth Kerr Lady Anne Kerr Lady Jean Kerr Lady Mary Kerr Partners Jean Janet Kerr Margaret Nicolson