Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Airgetmar
Airgetmar, son of Sirlám, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
The "Lebor Gabála Érenn" says that, during the reign of Ailill Finn, he killed Fíachu Tolgrach in battle, but was forced into exile overseas by Ailill's son Eochu, Lugaid son of Eochu Fíadmuine, and the men of Munster.
He returned to Ireland after seven years, and, with the help of Dui Ladrach, killed Ailill.
Eochu became king, but Airgetmar and Dui soon killed him as well, and Airgetmar took power.
Geoffrey Keating tells a slightly different story of Airgetmar's accession.
Eochu withstood Airgetmar, made an alliance with Dui and ruled for seven years, but Dui treacherously killed him at a meeting and Airgetmar took the throne.
He ruled for thirty years (according to the "Lebor Gabála" and the "Annals of the Four Masters"), or twenty-three or thirty-eight years (according to Keating), after which he was killed by Dui and Eochu's son Lugaid Laigdech.
Dui, who had now had a hand in the killing of four High Kings, took the throne.
The "Lebor Gabála" synchronises his reign with that of Artaxerxes III of Persia (358–338 BC).
The chronology of Keating's "Foras Feasa ar Éirinn" dates his reign to 570–547 BC, that of the "Annals of the Four Masters" to 778–748 BC.
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
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
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.
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 Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.
Sírlám
Sírlám, son of Finn mac Blatha, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He took power after killing his predecessor, Lugaid Íardonn, in Ráth Clochair.
His name means "long hand" or "long arm", and it is said his arms reached the ground when was standing up (compare the Irish god Lug, whose epithet "lámfada" also means "long arm").
He ruled for thirteen years according to the "Lebor Gabála Érenn", or sixteen according to Geoffrey Keating and the Four Masters.
He drove Lugaid's son Eochu Uairches into exile, but after twelve years overseas Eochu returned and killed him with an arrow.
The "Lebor Gabála" synchronises his reign with that of Artaxerxes I of Persia (465–424 BC).
The chronology of Keating's "Foras Feasa ar Éirinn" dates his reign to 649–633 BC, that of the "Annals of the Four Masters" to 872–856 BC.

Question: Who is Airgetmar's paternal grandfather?