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.
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.
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.
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Kennedy, 2nd Lord Kennedy
John Kennedy, PC, 2nd Lord Kennedy (12 October 1454 – 29 December 1508) was a Scottish lord, the son of Gilbert Kennedy, 1st Lord Kennedy and Catherine Maxwell.
He succeeded to the title of 2nd Lord Kennedy in 1479 after the death of his father.
He was a Commissioner to treat with the English in 1484.
He was invested as a Privy Counsellor (P.C.) in Scotland to King James III of Scotland.
Janet Kennedy
Janet Kennedy (c. 1480 – c. 1545), was a Scottish noble, the first daughter of John Kennedy, 2nd Lord Kennedy and Lady Elizabeth Gordon.
She is best known as the mistress of King James IV of Scotland.

Question: Who is the paternal grandfather of Janet Kennedy?
Answer: Gilbert Kennedy, 1st Lord Kennedy