Hugh Denis Charles FitzRoy, 11th Duke of GraftonKGDL (3 April 1919 – 7 April 2011) was the son of Charles FitzRoy, 10th Duke of Grafton, and his first wife Lady Doreen Maria Josepha Sydney Buxton, second daughter of Sydney Buxton, 1st Earl Buxton. He was known from 1936 to 1970 as Earl of Euston.
The Duke was a member of the Historic Buildings Council from its foundation in 1953, and until he succeeded his father as duke in 1970, he was the National Trust's administrator for Sussex and Kent, and later East Anglia. He was vice-chairman of the National Portrait Gallery. He was also the chairman of the English section of ICOMOS, the International Commission for Monuments and Sites and member of its international board.
Lady Henrietta Fortune Doreen FitzRoy (born 14 September 1949), who married Edward St. George.
Lady Virginia Mary Elizabeth FitzRoy (born 10 April 1954), who married (and divorced) Lord Ralph Kerr, son of Peter Kerr, 12th Marquess of Lothian; remarried, but has no issue.
Lord Charles Patrick Hugh FitzRoy (born 7 January 1957), who married Diana Miller-Stirling, and has two sons.
Lady (Olivia) Rose Mildred FitzRoy (born 1 August 1963), who married Guy Monson, an investment funds manager, and has two daughters, Olivia and Leonora.[5]