Thomas FitzAlan
Sir Thomas FitzAlan (died 1430) of Betchworth Castle in Surrey was a medieval English knight.
He was born to John FitzAlan, 2nd Baron Arundel and Elizabeth le Despenser of Betchworth and was a grandson of John FitzAlan (D'Arundel) and Eleanor Maltravers.
Sir Thomas married Joan Moyns, and they were parents of Eleanor FitzAlan.
She was married to Sir Thomas Browne.
They had four sons and a daughter, and were ancestors of the poet, Percy Bysshe Shelley.
Another descendant of theirs is the American Abolitionist, John Brown.
On the death of Thomas FitzAlan, Betchworth Castle passed from the FitzAlans to the Brownes, who occupied it until 1690.
Zhao Shoushan
Zhao Shoushan( 12 November 1894 – 20 June 1965) was a KMT general and later Chinese Communist Party politician.
He is the grandfather of Zhao Leji.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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
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.
John FitzAlan, 2nd Baron Arundel
John FitzAlan, 2nd Baron Arundel, 2nd Baron Maltravers "jure matris", also called John de Arundel (30 November 1364 – 14 August 1390), of Buckland, Surrey, was the son of John FitzAlan, 1st Baron Arundel and Eleanor Maltravers.
John was with the army in Scotland in 1383 and with the English Fleet in the western coast of France.
He married Elizabeth le Despenser, daughter of Edward le Despencer, 1st Baron le Despencer (Despenser), by Elizabeth Burghersh, daughter and heiress of Bartholomew de Burghersh, 2nd Baron Burghersh.
They had:
Sir John de Arundel, 2nd Lord Arundel, died on 14 August 1390, and was buried at Missenden Abbey, Buckinghamshire.
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.

Question: Who is Thomas Fitzalan's paternal grandfather?
Answer: John FitzAlan, 1st Baron Arundel