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.
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 Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Tiberius Gemellus
Tiberius Julius Caesar Nero Gemellus, known as Tiberius Gemellus (Latin: "
Tiberius Caesar Drusus filius
Tiberius Augustus nepos divus
Augustus pronepos"; 10 October AD 19–37/38) was the son of Drusus and Livilla, the grandson of the Emperor Tiberius, and the second cousin of the Emperor Caligula.
"
Gemellus" is a nickname meaning "the twin".
His twin brother, Tiberius Claudius Caesar Germanicus II Gemellus, died while still an infant in 23.
His father and older cousins died, and are suspected by contemporary sources as having been systematically eliminated by the powerful praetorian prefect Sejanus.
Their removal allowed Gemellus and Caligula to be named joint-heirs by Tiberius in 35, a decision that ultimately resulted in Caligula assuming power and having Gemellus killed, or by forcing him to kill himself, in late 37 or early 38.
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
John Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Zhao Shoushan
Zhao Shoushan( 12 November 1894 – 20 June 1965) was a KMT general and later Chinese Communist Party politician.
He is the grandfather of Zhao Leji.

Question: Who is the maternal grandfather of Tiberius Gemellus?
Answer: Nero Claudius Drusus