Grantham was commissioned an ensign in the 2nd Regiment of Foot Guards on 17 November 1727. He was promoted to lieutenant on 2 October 1731, and on 5 July 1735, was promoted captain-lieutenant in the 1st Regiment of Foot Guards.[2]
Grantham later involved himself in a project to create an orphanage for abandoned children in London, the first of its kind in the nation. The charity became known as the Foundling Hospital and received its royal charter on 17 October 1739. Lord Grantham was one of its founding Governors.
Henry (27 October 1697 – 19 June 1718), styled Viscount Boston from 24 December 1698.
Thomas (1700 – 27 April 1730), styled Viscount Boston, apparently unmarried.
Lady Frances de Nassau d'Auverquerque (born 1700s, d. 5 April 1772), who married 4 Jun 1737 St Paul's Benet Wharf (against her father's wishes) Captain (later Lieutenant-Colonel) William Elliot of Wells. Their only child died young.
Emilia Mary (born about 1702, died 1712) died at the age of aged 10
Lady Henrietta de Nassau d'Auverquerque (bapt 17 October 1712, died 23 September 1747), who married 27 September 1732 William Clavering-Cowper, 2nd Earl Cowper 1709–1764). Her son the 3rd Earl Cowper (1738–1789) became his uncle Lord Grantham's heir general after his aunt, Lady Frances Eliot's, death in 1772, and was created a Prince of the Holy Roman Empire in 1778[5] (which title expired in 1905 with the death of the last Earl Cowper). The current representative of this line is Lord Lucas (b. 1951), who is also Lord Dingwall in the Peerage of Scotland, and a co-heir to the Barony Butler since 1905.
^The Register Book for Burials. In the Parish of St James in Westminster in the County of Middlesex. 1754-1812. 12 December 1754.
^The Register of Burials in the Parish of St James within the Liberty of Westminster. 1723-1754. 20 October 1724.
^Hugh Belsey, 'Cowper, George Nassau Clavering, third Earl Cowper (1738–1789)’, Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, Jan 2008, accessed 26 April 2010
