Margaret de Clare
Margaret de Clare, Countess of Gloucester, Countess of Cornwall( 12 October 1293 – 9 April 1342) was an English noblewoman, heiress, and the second- eldest of the three daughters of Gilbert de Clare, 6th Earl of Hertford and his wife Joan of Acre, making her a granddaughter of King Edward I of England.
Her two husbands were Piers Gaveston and Hugh de Audley, 1st Earl of Gloucester.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Peter Kerr, 12th Marquess of Lothian
Peter Francis Walter Kerr, 12th Marquess of Lothian, (8 September 1922 – 11 October 2004) was a British peer, politician and landowner.
He was the son of Captain Andrew William Kerr by his wife, Marie Kerr.
Both of his parents were male-line descendants of William Kerr, 5th Marquess of Lothian.
Anne Yelverton
Anne Yelverton( 1628–1698) was Countess of Manchester and Countess of Halifax.
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.
Clare FitzRoy, Countess of Euston
Clare Amabel Margaret FitzRoy, Dowager Countess of Euston (née Kerr; born 15 April 1951) is the current Lord Lieutenant of Suffolk.
She is also President of the Suffolk Agricultural Association with a particular interest in local breeds the Suffolk Punch horse and the Red Poll cow.
Born in Jedburgh as Lady Clare Kerr, Lady Euston is the fourth child of Peter Kerr, 12th Marquess of Lothian, and his wife Antonella (née Newland).
Clare married James FitzRoy, Earl of Euston, son and heir apparent to the 11th Duke of Grafton, on 16 September 1972.
He predeceased his father in 2009.
Lord and Lady Euston had five children:
She had previously been High Sheriff and Deputy Lieutenant of Suffolk.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.

Question: Who is Clare Fitzroy, Countess Of Euston's paternal grandfather?
Answer: Captain Andrew William Kerr