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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Antonia Minor
Antonia Minor, also known as Julia Antonia Minor, Antonia the Younger or simply Antonia
(31 January 36 BC - 1 May AD 37) was the younger of two daughters of Mark Antony and Octavia Minor.
She was a niece of the Emperor Augustus, sister of Cleopatra Selene II, sister-in-law of the Emperor Tiberius, paternal grandmother of the Emperor Caligula and Empress Agrippina the Younger, mother of the Emperor Claudius, and both maternal great-grandmother and paternal great-aunt of the Emperor Nero.
She was additionally the maternal great-aunt of the Empress Valeria Messalina and Faustus Cornelius Sulla Felix, the paternal grandmother of Claudia Antonia, Claudia Octavia, and Britannicus and the maternal grandmother of Julia Livia and Tiberius Gemellus.
Livilla
Claudia Livia Julia (Classical Latin: ; c. 13 BC – AD 31) was the only daughter of Nero Claudius Drusus and Antonia Minor and sister of the Roman Emperor Claudius and general Germanicus, and thus the paternal aunt of the emperor Caligula and maternal great-aunt of emperor Nero, as well as the niece and daughter-in-law of Tiberius.
She was named after her grandmother, Augustus' wife Livia Drusilla, and commonly known by her family nickname Livilla ("little Livia").
She was born after Germanicus and before Claudius.
She was twice married to the potential successor in the Julio-Claudian dynasty, first to Augustus' grandson Gaius Caesar
(died 4 AD) and later to Tiberius' son Drusus the Younger (died AD 23).
Allegedly, she helped her lover Sejanus in poisoning her second husband and died shortly after Sejanus fell from power in AD 31.

Question: Who is Livilla's maternal grandfather?
Answer: Mark Antony