Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Thorstein Eiriksson
Thorstein Eiriksson  was the third and youngest son of Erik the Red.
Almost nothing is known about Thorstein's life.
According to the Vinland Sagas, Erik the Red settled in Greenland around 986 with his wife and three grown sons, Leif, Thorvald and Thorstein.
After Leif had sailed west from Greenland and discovered Vinland, Thorvald organized and led a second expedition to this new country.
The natives, called Skraelings by the Norse, attacked Thorvald and his men.
Thorvald received a fatal wound and was buried in Vinland.
His crew returned to Greenland.
Thorstein subsequently set sail for Vinland to retrieve his brother's body, along with his wife Gudrid.
The ship was beset by bad weather and never reached Vinland.
By the first week of winter they had returned to Greenland and landed at Lysufiord in the Western Settlement where they sought shelter with the families living there.
That winter an epidemic swept the settlement killing Thorstein and several others.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Erik the Red
Erik Thorvaldsson (950 – 1003), known as Erik the Red, was a Norse explorer, described in medieval and Icelandic saga sources as having founded the first settlement in Greenland.
According to Icelandic sagas, he was born in the Jæren district of Rogaland, Norway, as the son of Thorvald Asvaldsson.
He therefore also appears, patronymically, as Erik Thorvaldsson.
The appellation "the Red" most likely refers to the color of his hair and beard.
Icelandic explorer Leif Erikson was Erik's son.

Question: Who is the paternal grandfather of Thorstein Eiriksson?
Answer: Thorvald Asvaldsson