Irina Brook
Irina Brook (born April 5, 1962) is a Franco-British stage director and producer.
She was named Chevalier des Arts et des Lettres in 2002 by the French Ministry of Culture.
In May 2017 Brook was upgraded to Officier de l'ordre des Arts et Lettres and awarded the Légion d'honneur.
Born in Paris, the daughter of film and theater director Peter Brook and actress Natasha Parry, Brook grew up between England and France and began her working life as an actress.
Her family is of Jewish descent.
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.
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
Natasha Parry
Natasha Parry (2 December 1930 – 22 July 2015) was an English actress.
The daughter of film director Gordon Parry, she was married to theatre director Peter Brook from 1951 until her death, and is the mother of filmmakers Irina and Simon.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
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 the maternal grandfather of Irina Brook?
Answer: Gordon Parry