Beresford married Frances, daughter of Gervase Parker Bushe, daughter of Gervase Parker Bushe and Mary Grattan (sister of Henry Grattan), in 1794. They had several children, including John de la Poer Beresford, Colonial Secretary of St Vincent,West Indies, for 31 years, who married Harriet Eliza, daughter of Hon. William Wylly, Chief Justice of St Vincent, 06/05/1822. Died 16/09/1856 aged 61 at Shirley, Southampton. He is listed as receiving £148 as compensation for 6 slaves during abolition. Marcus Beresford, Archbishop of Armagh. Beresford died in October 1841, aged 76.[3][1] His wife survived him by two years and died in May 1843. His daughter Charlotte married into the Lumley family and was the mother of the ninth earl of Scarbrough.[4]