Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
İsfendiyar Bey
İsfendiyar Bey( full name: İzzettin İsfendiyar) was the bey( ruler) of Candaroğlu Beylik an Anatolian beylik between 1385 and 1440.
( Anatolia is the Asiatic part of Turkey)
Although the name of the dynasty is" Candar", Ottoman Empire historians call the beylik" İsfendiyaroğlu" because of İsfendiyar's long reign
His father was Kötürüm Bayazıt of the Candar dynasty and his mother was Sultan Hatun, the daughter of Süleyman Pasha and the granddaughter of Orhan of the Ottoman Empire, the second bey of the Ottoman Empire.
His daughter Sultan Hatun was married firstly to Sultan Murad II and after Murad's death to Ishak Pasha, one of Murad II officials.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
Mehmed I
Mehmed I (1379 – 26 May 1421), also known as Mehmed Çelebi ("the noble-born") or Kirişçi (from Greek "Kyritzeslord's son"), was the Ottoman Sultan from 1413 to 1421.
The fourth son of Sultan Bayezid I and Devlet Hatun, he fought with his brothers over control of the Ottoman realm in the Ottoman Interregnum (1402–1413).
Starting from the province of Rûm he managed to bring first Anatolia
and then the European territories (Rumelia)
under his control, reuniting the Ottoman state by 1413, and ruling it until his death in 1421.
Mihaloğlu Mehmed Bey
Mihaloğlu Mehmed Bey was a member of the Mihaloğulları family and one of the most important frontier warlords ("uch bey") of the Ottoman Balkans during the last phase of the civil war of the Ottoman Interregnum (1403–1413), and during the early years of Murad II's reign.
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.
Murad II
Murad II's reign was marked by the long war he fought against the Christian feudal lords of the Balkans and the Turkish beyliks in Anatolia, a conflict that lasted 25 years.
He was brought up in Amasya, and ascended the throne on the death of his father Mehmed I.
His mother was Valide Sultan Emine Hatun (daughter of Suleyman Bey, ruler of Dulkadirids), his father's third consort.
Their marriage served as an alliance between the Ottomans and this buffer state.

Question: Who is Murad Ii's paternal grandfather?
Answer: Bayezid I