Background
He married, firstly, Lady Harriet Hobart-Hampden, a younger daughter of John Hobart, 2nd Earl of Buckinghamshire (and the divorced wife of Armar Lowry-Corry, 1st Earl Belmore), on 14 April 1793.
He married, firstly, Lady Harriet Hobart-Hampden, a younger daughter of John Hobart, 2nd Earl of Buckinghamshire (and the divorced wife of Armar Lowry-Corry, 1st Earl Belmore), on 14 April 1793.
They had four children:
John Kerr, 7th Marquess of Lothian (1794–1841)
Lord Schomberg Robert (1795–1825), soldier, died unmarried. Lady Isabella Emily Caroline (1797–1858), died unmarried. Lord Henry Francis Charles (1800–1882), religious minister, married Louisa Hope, a daughter of Sir Alexander Hope.
They had eight children:
Lady Elizabeth Georgiana Kerr (died 1871), married Charles Trefusis, 19th Baron Clinton.
Lady Harriet Louise Anne (died 1884), married Sir John Hepburn-Forbes, 8th Baronet. Lady Frances (died 1863), married George Wade.
Lady Anne Katherine (died 1829), died unmarried. Lady Georgiana Augusta (died 1859), married Review
Granville Forbes. Lord Charles Lennox (1814–1898), soldier, married Charlotte Hanmer, a daughter of Sir Thomas Hanmer, 2nd Baronet.
Lord Mark Ralph George (1817–1900), soldier, died unmarried. Lord Frederick Herbert (1818–1896), admiral, married Emily Maitland, a daughter of Sir Peregrine Maitland.