Almeric FitzRoy
Sir Almeric William FitzRoy( 12 November 1851 – 31 May 1935) was a British civil servant.
FitzRoy was the son of Francis Horatio FitzRoy( 1823 – 1900), the grandson of Rear Admiral Lord William FitzRoy and the great- grandson of Augustus FitzRoy, 3rd Duke of Grafton.
He was Clerk of the Privy Council between 9 August 1898 and May 1923.
FitzRoy was invested as a Commander of the Royal Victorian Order( CVO) by King Edward VII at Buckingham Palace on 11 August 1902, and later promoted to a Knight Commander( KCVO) of the Order in 1909.
Henry FitzRoy, 5th Duke of Grafton
Henry FitzRoy, 5th Duke of Grafton (10 February 1790 – 26 March 1863), styled Viscount Ipswich until 1811 and Earl of Euston between 1811 and 1844, was a British peer and politician.
Grafton was the son of George FitzRoy, 4th Duke of Grafton and Lady Charlotte Maria Waldegrave, daughter of James Waldegrave, 2nd Earl Waldegrave.
The 6th Duke was a politician.
He represented Bury St Edmunds as a Whig between 1818 and 1820 and again between 1826 and 1831, and was member for Thetford between 1834 and 1841.
On 24 May 1830, he was commissioned colonel of the West Suffolk Militia.
Grafton married Mary Caroline Berkeley (daughter of Admiral the Hon.
Sir George Cranfield Berkeley), on 20 June 1812 in Portugal.
They had five children:
Grafton died in 1863, aged seventy-three, at Wakefield Lodge, near Potterspury, Northamptonshire.
William FitzRoy, 6th Duke of Grafton
William Henry Fitzroy, 6th Duke of Grafton (5 August 1819 – 21 May 1882), styled Viscount Ipswich until 1847 and Earl of Euston between 1847 and 1863, was a British peer and Liberal Party politician.
He was born in London and educated at Harrow, and after went to RMA Sandhurst.
He was the son of Henry FitzRoy, 5th Duke of Grafton and his wife Mary Caroline Berkeley, who were married on 20 June 1812 in Lisbon.
At the time his father was an officer fighting with the Duke of Wellington in the Peninsular War.
At the 1847 general election he was elected unopposed as a Member of Parliament (MP) for the borough of Thetford in Norfolk, a seat held by his father from 1834 to 1841.
He was returned unopposed at the next three general elections, and held the seat until he succeeded to his father's peerage in 1863.
Grafton married the Honourable Marie Anne Louise Baring, daughter of Francis Baring, 3rd Baron Ashburton, on 10 February 1858.
He spent the winter and spring each year at Hyères because he and his wife both suffered from ill health.
In 1860 he was appointed lieutenant-colonel in command of the 1st Administrative Battalion of Northamptonshire Rifle Volunteers.
He died childless in 1882, aged 62, in London and was succeeded as Duke of Grafton by his younger brother, Augustus.
William FitzRoy (British Army Officer)
Major- General William FitzRoy( 1830 – 7 October 1902) was a British Army officer.
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.
Jacobo Fitz-James Stuart, 6th Duke of Liria and Jérica
" Don" Jacobo José María Fitzjames- Stuart y Silva, 6th Duke of Berwick, 6th Duke of Liria, 6th Duke of Jérica, Grandee of Spain( 3 January 1792 – 5 January 1795) was the second surviving son of the 5th Duke of Berwick, briefly inheriting his titles.
He died at age three and two days and passed them onto his younger brother Carlos Miguel Fitz- James Stuart.
John FitzRoy, 9th Duke of Grafton
John Charles William Fitzroy, 9th Duke of Grafton (1 August 1914 – 4 August 1936), was a British peer and politician, styled The Honourable John FitzRoy from 1914 to 1918, Viscount Ipswich in 1918, and Earl of Euston from 1918 to 1930.
John Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.
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.
Charles Gordon-Lennox, 6th Duke of Richmond
Charles Henry Gordon- Lennox, 6th Duke of Richmond, 6th Duke of Lennox, and 1st Duke of Gordon,( 27 February 181827 September 1903), styled Lord Settrington until 1819 and Earl of March between 1819 and 1860, was a British Conservative politician.

Question: Who is the paternal grandfather of William Fitzroy, 6Th Duke Of Grafton?
Answer: George FitzRoy, 4th Duke of Grafton