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) •
George FitzRoy, Earl of Euston (24 August 1715 – 7 July 1747). He was married on 10 October 1741 to Lady Dorothy Boyle (14 May 1724 – 2 May 1742) elder daughter of
Richard Boyle, 4th Earl of Cork, 3rd Earl of Burlington, and his wife Lady
Dorothy Savile, daughter of
William Savile, 2nd Marquess of Halifax. The Earl was notorious for mistreating his wife—who died seven months after their marriage—and died childless. •
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: •
Augustus FitzRoy, 3rd Duke of Grafton •
Charles FitzRoy, 1st Baron Southampton • Lord Charles FitzRoy (23 April 1718 – 29 July 1739) •
Lady Caroline FitzRoy (8 April 1722 – 26 June 1784). She married
William Stanhope, 2nd Earl of Harrington. They were parents to
Isabella Molyneux, Countess of Sefton,
Charles Stanhope, 3rd Earl of Harrington and five other children. • Lady Harriet FitzRoy (8 June 1723 – August 1735) •
Lady Isabella FitzRoy (1726 – 10 November 1782). She married
Francis Seymour-Conway, 1st Marquess of Hertford. They were parents to
Francis Seymour-Conway, 2nd Marquess of Hertford and eleven other children. The Duke also fathered an illegitimate son,
Charles FitzRoy-Scudamore. (1765)Hunterian Art Gallery, University of Glasgow ==Legacy==