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).
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
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Suddha Dibyaratana
Suddha Dibyaratana, Princess of Rattanakosin (14 September 1877 – 2 January 1922), was the Princess of Siam (later Thailand).
She was a member of the Siamese Royal Family.
She was given the highest rank of any daughter of Chulalongkorn, King Rama V of Siam.
Her mother was Queen Sukhumala Marasri, fourth Queen Consort and half-sister of King Chulalongkorn.
She had a younger brother, Paribatra Sukhumbandhu, the Prince of Nakhon Sawan.
Her full given name was "Suddha Dibyaratana Sukhumkhattiya Galyavadi"
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She was, if not, one of the most beautiful princess out of all the King's daughters.
On 9 August 1906, she was given the royal title of The Princess of Rattanakosin, translated in Thai as Krommaluang Si Rattanakosin .
She was the only daughter given the rank of "Krommaluang", the 3rd level of the "Krom" ranks.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Sukhumala Marasri
Sukhumala Marasri (10 May 1861 – 9 July 1927) was a daughter of King Mongkut (Rama IV) and his concubine, Samli (เจ้าคุณจอมมารดาสำลี).
Her given name was Princess Sukhumala Marasri (พระองค์เจ้าสุขุมาลมารศรี).
She was later one of the four consorts of her half-brother King Chulalongkorn (Rama V).
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.
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.

Question: Who is the maternal grandfather of Suddha Dibyaratana?
Answer: Mongkut