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.
Maximilian Sforza
Maximilian Sforza (Italian: "Massimiliano Sforza", 25 January 1493 – 4 June 1530) was a Duke of Milan from the Sforza family, the son of Ludovico Sforza.
He ruled 1512–1515, between the occupations of Louis XII of France (1500–1512), and Francis I of France in 1515.
After the French victory at the Battle of Marignano, Massimiliano was imprisoned by the returning French troops.
He waived his rights to Milan for the sum of 30,000 ducats and continued to live in France.
When he was three his father tried to arrange a marriage between him and Mary Tudor, the younger daughter of King Henry VII of England.
However, Henry VII rejected the proposal as Massimiliano's father was hoping that Henry would help him against the French, which was not in Henry's interest.
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.
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.
Ludovico Sforza
Ludovico Maria Sforza (27 July 1452 – 27 May 1508), also known as Ludovico il Moro ("the Moor"), was an Italian Renaissance prince who ruled as Duke of Milan from 1494, following the death of his nephew Gian Galeazzo Sforza, until 1499.
A member of the Sforza family, he was the fourth son of Francesco I Sforza.
He was famed as a patron of Leonardo da Vinci and other artists, and presided over the final and most productive stage of the Milanese Renaissance.
He is probably best known as the man who commissioned "The Last Supper".
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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).
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.

Question: Who is Maximilian Sforza's paternal grandfather?
Answer: Francesco I Sforza