John Christian Kunkel
John Christian Kunkel (September 18, 1816 – October 14, 1870) was a Whig and Republican member of the U.S. House of Representatives from Pennsylvania.
He was the grandfather of John Crain Kunkel.
Frances Cornford
Frances Crofts Cornford (née Darwin; 30 March 1886 – 19 August 1960) was an English poet; because of the similarity of her first name, her father's and her husband's, she was known to her family before her marriage as "FCD" and after her marriage as "FCC" and her husband Francis Cornford was known as "FMC".
Her father Sir Francis Darwin, a son of Charles Darwin, yet another 'Francis', was known to their family as "Frank", or as "Uncle Frank".
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Gilbert Talbot, 3rd Baron Talbot
Gilbert Talbot, 3rd Baron Talbot( c. 1332–1387) was an English nobleman and soldier.
He was the grandfather of John Talbot, 1st Earl of Shrewsbury.
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
Archibald Hope, Lord Rankeillor
Sir Archibald Hope, Lord Rankeillor (1639 – 10 October 1706) was a Scottish advocate and judge, the second son of John Hope, Lord Craighall, the grandfather of the botanist John Hope and the great-grandfather of the chemist Thomas Charles Hope, FRSE.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Cornford
Rupert John Cornford (27 December 1915 – 28 December 1936) was an English poet and communist.
He was the son of Francis Cornford and Frances Cornford (née Darwin), and was a great-grandson of Charles Darwin and Emma Darwin.
During the first year of the Spanish Civil War, he was a member of the POUM militia and later the International Brigades.
He died while fighting against the Nationalists, at Lopera, near Córdoba.
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 John Cornford's maternal grandfather?
Answer: Francis Darwin