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).
Princess Nadejda Petrovna of Russia
Princess Nadejda Petrovna of Russia (Russian: Надежда Петровна; 3 March 1898 – 21 April 1988) was the third child of Grand Duke Peter Nikolaevich of Russia and his wife, the former Princess Milica of Montenegro.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Irina Paley
Princess Irina Pavlovna Paley( 21 December 1903 – 15 November 1990) was the daughter of Grand Duke Paul Alexandrovich of Russia and his second wife, Olga Valerianovna Karnovich.
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.
Princess Irina Nikolaïevna Orlova
Princess Irina Nikolaïevna Orlova (March 1, 1918–September 16, 1989) was the eldest child of Prince Nicholas Vladimirovich Orlov and his wife, Princess Nadejda Petrovna of Russia.
Her mother was among the Romanovs who escaped the Russian Revolution in 1919 aboard the British ship , aboard which Princess Irina was the youngest passenger.
She had one sister named Princess Xenia (aka Ksenija)
Nikolaïevna Orlova (1921–1963).
Irina Orlova Nikolaievna married Baron Hans von Waldstatten (1918–1977) in Rome 27 March 1940.
They divorced in 1946.
They had one daughter:
After her divorce, Irina had a son named Alexis Nicolas Orlov.
He was born 10 September 1947.
She married Anthony Adama Zylstra (1902–1982) in the Hague, the Netherlands on 8 January 1960.
She died on 16 September 1989 at age 71 at Villacerf, France.
Irina Yusupova
Princess Irina Felixovna Yusupova, nicknamed" Bébé",( 21 March 1915 – 30 August 1983) was born in Petrograd, Russian Empire, the only child of Prince Felix Yusupov and Princess Irina of Russia.

Question: Who is the maternal grandfather of Princess Irina Nikolaïevna Orlova?