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).
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.
Marulla of Verona
Marulla of Verona or Maria of Verona (Italian: "Marulla da Verona"; died 1326), was Lady of Karystos in Frankish Greece in 1318-1326.
She was the daughter of Boniface of Verona, Lord of Karystos, Triarch of Negroponte, and one of the major barons of the Duchy of Athens.
She married Alfonso Fadrique, the illegitimate son of Frederick II of Sicily.
She left five sons and two daughters:
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.
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
Peter Fadrique
Peter (I) Fadrique (died 1355), Count of Salona, was the eldest son of Alfonso Fadrique, vicar general of Athens and Neopatras, and Marulla of Verona.
As the Papacy supported the claims of Walter VI of Brienne on the Duchy of Athens, Peter (along with his father and his brother James) was among the Catalan leaders excommunicated on 29 December 1335 by William Frangipani, Latin Archbishop of Patras.
Alfonso died in about 1338, and Peter succeeded his father in the County of Salona, the baronies of Loidoriki, Veteranitsa, Aegina, and perhaps Zetouni.
His possessions were confiscated by the Crown of Aragon sometime between 1350 and Peter's death, which occurred before 1355.
The reason for the confiscation is unknown, but after Peter's death his fiefs were restored to his younger brother James, as had been stipulated by Alfonso in his will.
Another brother, John, appears as lord of Aegina
(and nearby Salamis) already in 1350.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.

Question: Who is Peter Fadrique's maternal grandfather?
Answer: Boniface of Verona