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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Sibylla of Lusignan
Sibylla of Lusignan (or Sibylle de Lusignan) (October/November 1198 – c. 1230 or 1252) was a queen consort of Armenia.
She was the daughter of King Amalric of Cyprus and Queen Isabella I of Jerusalem.
She was a member of the House of Lusignan.
She was the second wife of King Leo I of Armenia, married in 1210, by whom she had one daughter
John of Lusignan
John of Lusignan( or Jean de Lusignan)( c. 1329 or 1329/1330–1375), regent of the Kingdom of Cyprus and titular Prince of Antioch.
He was son of King Hugh IV of Cyprus and his second wife, Alix of Ibelin.
He was a member of the House of Lusignan.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Phoebus of Lusignan
Phoebus of Lusignan( died after July, 1485 in Rome)( also called Febo or Febos in Portuguese) was a titular Marshal of Armenia and also titular Lord of Sidon, the illegitimate son of Peter of Lusignan, titular Count of Tripoli.
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Isabella I of Jerusalem
Isabella I (1172 – 5 April 1205) was Queen regnant of Jerusalem from 1190 to her death.
She was the daughter of Amalric I of Jerusalem and his second wife Maria Comnena.
Her half-brother, Baldwin IV of Jerusalem, engaged her to Humphrey IV of Toron.
Her mother's second husband, Balian of Ibelin, and his stepfather, Raynald of Châtillon, were influential members of the two baronial parties.
The marriage of Isabella and Humphrey was celebrated in Kerak Castle in autumn 1183.
Saladin, the Ayyubid sultan of Egypt and Syria, laid siege to the fortress during the wedding, but Baldwin IV forced him to lift the siege.
Baldwin IV, who suffered from lepromatous leprosy, had made his nephew (the only son of his sister, Sybilla by her first husband), Baldwin V, his heir and co-ruler, to prevent Sybilla's second husband, Guy of Lusignan, from mounting the throne.
The High Court of Jerusalem stipulated that a committee of Western European rulers was entitled to choose between Sybilla and Isabella to succeed Baldwin V if he died before reaching the age of majority, but Sybilla and Guy of Lusignan were crowned soon after Baldwin V died in 1185.
Guy's opponents tried to play Isabella and her husband off against him, but Humphrey did homage to the royal couple.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.

Question: Who is the maternal grandfather of Sibylla Of Lusignan?
Answer: Amalric I of Jerusalem