On 6 February 1796 he married Henrietta Margaret Staples, daughter of
John Staples and Harriet Conolly. They had the following children: • Lady Lucy Le Poer Trench (d. 1839), married Robert Maxwell • Lady Louisa Augusta Anne Le Poer Trench (b. 23 December 1796, d. 7 February 1881), married Reverend William Le Poer Trench •
Lady Harriet Margaret Le Poer Trench (b. 13 October 1799, d. 1885), married
Thomas Kavanagh "the MacMurrough", a descendant of
Art mac Art MacMurrough-Kavanagh • Lady Emily Florinda Le Poer Trench (b. 7 November 1800), married Giovanni Cossiria • Lady Frances Power Le Poer Trench (b. 22 January 1802, d. 28 December 1804) •
William Thomas Le Poer Trench, 3rd Earl of Clancarty (b 21 September 1803, d. 26 April 1872), married
Lady Sarah Juliana Butler, daughter of
Somerset Richard Butler, 3rd Earl of Carrick • Hon. Richard John Le Poer Trench (b. 1805) • Commander Hon. Frederick Robert Le Poer Trench (b. 23 July 1808, d. April 1867), married Catherine Maria Thompson ==Ancestry==