Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Minamoto no Chikako
She was the mother of Prince Morinaga.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Prince Nikita Alexandrovich of Russia
Prince Nikita Alexandrovich of Russia (13 January 1900 – 12 September 1974) was the third son and fourth child of Grand Duke Alexander Mikhailovich of Russia and Grand Duchess Xenia Alexandrovna of Russia.
He was a nephew of Tsar Nicholas II of Russia.
Born in Imperial Russia during the reign of his uncle, Prince Nikita escaped the fate of many of his relatives who were killed by the Bolsheviks.
He left Russia in April 1919, at age nineteen.
In 1922 he married Countess Maria Vorontsova-Dashkova.
The couple had two children.
Prince Alexander Romanov
Prince Alexander Nikitich Romanov (4 November 1929 – 22 September 2002) was a member of the Romanov family.
He was a son of Prince Nikita Alexandrovich of Russia and a great nephew of Nicholas II of Russia, the last Tsar.
Born in France, he took British citizenship in 1938 and lived with his grand mother Grand Duchess Xenia Alexandrovna in England until her death in 1960.
The following year, Prince Alexander Nikitich became the first member of the Romanov family to visit Russia after the Revolution.

Question: Who is Prince Alexander Romanov's paternal grandfather?
Answer: Grand Duke Alexander Mikhailovich of Russia