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.
Khafra
Khafra (also read as Khafre, Khefren and Chephren) was an ancient Egyptian king (pharaoh) of the 4th Dynasty during the Old Kingdom.
He was the son of Khufu and the throne successor of Djedefre.
According to the ancient historian Manetho, Khafra was followed by king Bikheris, but according to archaeological evidence he was instead followed by king Menkaure.
Khafra was the builder of the second largest pyramid of Giza.
The view held by modern Egyptology at large continues to be that the Great Sphinx was built in approximately 2500 BC for Khafra.
Not much is known about Khafra, except from the historical reports of Herodotus, writing 2,000 years after his life, who describes him as a cruel and heretical ruler who kept the Egyptian temples closed after Khufu had sealed them.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Rekhetre
Rekhetre was an ancient Egyptian queen from the late 4th dynasty or early 5th dynasty.
She was a daughter of Pharaoh Khafra.
Her husband is never mentioned, but Rekhetre would have been the wife of one of Khafre's successors, possibly Menkaure.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.

Question: Who is Rekhetre's paternal grandfather?
Answer: Khufu