On 30 April 1713, he married Lady Henrietta Somerset (27 August 1690 – 7 August 1726), daughter of Charles Somerset, Marquess of Worcester and Rebecca Child. They had seven children:
Charles Henry FitzRoy, Earl of Euston (13 April 1714 – 18 December 1715)
Lord Augustus FitzRoy (16 October 1716 – 24 May 1741). He was married to Elizabeth Cosby, daughter of Colonel William Cosby, who served as a colonial Governor of New York. They were parents to two sons, who founded branches of the family that still continue today:
^Kneller portrait of Grafton. Accessed 21 August 2017.
^Rachel Wilson, "The Vicereines of Ireland and the Transformation of the Dublin Court, c. 1703-1737" in The Court Historian, xix, no. 1 (2014).
^Leo van der Pas. "George Fitzroy, Earl of Euston (1715–1747)". Archived from the original on 20 April 2004. Retrieved 20 April 2004. from Brigitte Gastel-Lloyd's Worldroots website. Retrieved in cached version on 7 October 2009.
Sources
R.H. Nichols and F.A. Wray, The History of the Foundling Hospital (London: Oxford University Press, 1935)