Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
Prithvipati Shah
Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.
He was the grandfather of Nara Bhupal Shah.
Ethel Kennedy
Ethel Skakel Kennedy (born April 11, 1928) is an American human rights advocate.
Kennedy is the widow of U.S. Senator Robert F. Kennedy as well as the sixth child of George Skakel and Ann Brannack.
She married Robert F. Kennedy in 1950, and the couple had eleven children together.
Shortly after her husband's June 5, 1968 assassination, Kennedy founded the Robert F. Kennedy Center for Justice and Human Rights.
The organization is a nonprofit charity working to realize Robert F. Kennedy's dream of a just and peaceful world.
In 2014, Ethel Kennedy was awarded the Presidential Medal of Freedom by President Barack Obama.
Douglas Harriman Kennedy
Douglas Harriman Kennedy (born March 24, 1967) is an American journalist.
He is the tenth child of Robert F. Kennedy and Ethel Kennedy, named in honor of W. Averell Harriman, a family friend and former governor of New York.
Archibald I, Lord of Douglas
Archibald of Douglas( before 1198 – d.c. 1238) was a Scottish Nobleman.
He was the son of William of Douglas.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Fujiwara no Nagara
, also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.
He was the grandfather of Emperor Yōzei.
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.

Question: Who is Douglas Harriman Kennedy's maternal grandfather?
Answer: George Skakel