Augustus FitzRoy, 7th Duke of Grafton
Augustus Charles Lennox FitzRoy, 7th Duke of Grafton (22 June 1821 – 4 December 1918), styled Lord Augustus FitzRoy before 1882, was the second son of Henry FitzRoy, 5th Duke of Grafton and his wife, Mary Caroline, daughter of Admiral the Hon.
Sir George Cranfield Berkeley.
On 9 June 1847, he married Anna Balfour, daughter of James Balfour MP, and had four children:
He died in 1918, aged 97, at Wakefield Lodge, near Potterspury, Northamptonshire.
Charles Gordon-Lennox, 8th Duke of Richmond
Charles Henry Gordon- Lennox, 8th Duke of Richmond, 8th Duke of Lennox, 3rd Duke of Gordon,( 30 December 1870 – 7 May 1935), known as Lord Settrington 1870 – 1903, and as Earl of March 1903 – 1928, was a British Peer and politician.
Henry FitzRoy, 12th Duke of Grafton
Henry Oliver Charles FitzRoy, 12th Duke of Grafton( born 6 April 1978), known as Harry Grafton, is an English peer and music promoter.
He inherited the Dukedom of Grafton from his grandfather, Hugh FitzRoy, 11th Duke of Grafton, on 7 April 2011.
He is also a direct male- line descendant of Charles II of England.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Hugh FitzRoy, 11th Duke of Grafton
Hugh Denis Charles FitzRoy, 11th Duke of Grafton (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 the Earl of Euston.
Alfred FitzRoy, 8th Duke of Grafton
Alfred William Maitland FitzRoy, 8th Duke of Grafton (3 March 1850 – 10 January 1930), styled Lord Alfred FitzRoy between 1882 and 1912 and Earl of Euston between 1912 and 1918, was the second son of Augustus FitzRoy, 7th Duke of Grafton and his wife Anna Balfour, daughter of James Balfour (1845) and aunt of Arthur Balfour.
His elder brother and heir to the dukedom Henry James FitzRoy, Earl of Euston died in 1912, before their father's death.
He married, firstly, Margaret Rose Smith (1855–1913), on 27 April 1875 and had three children:
The 8th Duke married, secondly, Susanna Mary McTaggart-Stewart (1878–1961), on 8 January 1916 and had two daughters:
On 15 March 1920, he was appointed a deputy lieutenant of Suffolk.
The Duke died in 1930 and was succeeded by his grandson, John, Earl of Euston.
Fortune FitzRoy, Duchess of Grafton
Ann Fortune FitzRoy, Dowager Duchess of Grafton,( née Smith; 24 February 1920), is the widow of Hugh FitzRoy, 11th Duke of Grafton.
She has been Mistress of the Robes since 1967.
William Montagu Douglas Scott, 6th Duke of Buccleuch
William Henry Walter Montagu Douglas Scott, 6th Duke of Buccleuch and 8th Duke of Queensberry( 9 September 1831 – 5 November 1914) was a Scottish Member of Parliament and peer.
He was the paternal grandfather of Princess Alice, Duchess of Gloucester, and the maternal great- grandfather of Prince William of Gloucester and Prince Richard, Duke of Gloucester.
He was a paternal great- great- grandfather to Sarah, Duchess of York.
George Howard, Baron Howard of Henderskelfe
Major George Anthony Geoffrey Howard, Baron Howard of Henderskelfe, JP( 22 May 1920 – 27 November 1984) was a British politician, soldier and media man.
Howard was a younger son of Geoffrey Howard and Ethel Christian Methuen, and grandson of the 9th Earl of Carlisle and the 3rd Baron Methuen.
He was educated at Eton and Balliol College, Oxford and fought in the Second World War with the Green Howards, being wounded in Burma.
In 1952 Howard was appointed to the office of Justice of the Peace for Yorkshire.
He was chairman of the Board of Governors of the BBC from 1980 to 1983 after being a governor for eight years.
He was made a life peer 1 July 1983 with the title Baron Howard of Henderskelfe, of Henderskelfe in the County of North Yorkshire.
Howard married Lady Cecilia Blanche Genevieve FitzRoy( born 13 May 1922, died 1974), a daughter of Alfred FitzRoy, 8th Duke of Grafton, on 11 May 1949.
They had four sons: Howard owned Castle Howard in North Yorkshire, which was televised in" Brideshead Revisited" in 1981.
He died from cancer.
Juan de Dios de Silva y Mendoza y Haro, 10th Duke of the Infantado
Juan de Dios de Silva y Mendoza y Haro (13 November 1672 – 9 December 1737), was a Spanish noble from the House of Mendoza.
He was the 10th Duke of the Infantado, the 8th Duke of Lerma and the 6th Duke of Pastrana.

Question: Who is the paternal grandfather of Alfred Fitzroy, 8Th Duke Of Grafton?
Answer: Henry FitzRoy, 5th Duke of Grafton