Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Ajit Singh (Sikhism)
Ajit Singh( 26 January 1687 – 07 December 1704), also referred to with honorifics as Sahibzada Ajit Singh or Baba Ajit Singh, was the eldest son of Guru Gobind Singh.
His younger brothers were Sahibzada Jujhar Singh, Sahibzada Zorawar Singh and Sahibzada Fateh Singh.
He was martyred during the Second Battle of Chamkaur along with his brother Jhujhar Singh where the other two young brothers Sahibzada Joravar Singh and Sahibzada Fateh Singh were bricked alive which place is known as Fatehgarh Sahib.
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.
Fateh Singh (Delhi politician)
Chaudhary Fateh Singh, also known as Fateh Singh, is an Indian politician from the Aam Aadmi Party( AAP) in Delhi.
He is member of the Sixth Legislative Assembly of Delhi and represents Gokalpur( Assembly constituency) of Delhi.
Earlier, he was a member of the Bharatiya Janata Party( BJP).
He was a member of First Legislative Assembly of Delhi and served as its deputy speaker from 1995 to 1998.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Fateh Singh (Sikhism)
Sahibzada Fateh Singh Ji (12 December 1699 – 26 December 1704) was the fourth and youngest son of Guru Gobind Singh.
He and his older brother, Sahibzada Zorawar Singh are among the most hallowed martyrs in Sikhism.
He is also known as "Baba" Fateh Singh.
The term "Baba" is used in India for an elder who is respected for his wisdom.
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.
Fateh Singh (Sikh leader)
Fateh Singh( 27 October 1911 – 30 October 1972) was an Indian Sikh religious and political leader, and a key figure in the Punjabi Suba movement.
He was revered as Sant Fateh Singh among his followers.
Guru Gobind Singh
Guru Gobind Singh (5 January 1666 – 7 October 1708), born Gobind Rai, was the tenth Sikh Guru, a spiritual master, warrior, poet and philosopher.
When his father, Guru Tegh Bahadur, was beheaded for refusing to convert to Islam, Guru Gobind Singh was formally installed as the leader of the Sikhs at age nine, becoming the tenth Sikh Guru.
His four sons died during his lifetime – two in battle, two executed by the Mughal army.
Among his notable contributions to Sikhism are founding the "Sikh" warrior community called "Khalsa" in 1699 and introducing "the Five Ks", the five articles of faith that Khalsa Sikhs wear at all times.
Guru Gobind Singh is credited with the "Dasam Granth" whose hymns are a sacred part of Sikh prayers and Khalsa rituals.
He is also credited as the one who finalized and enshrined the "Guru Granth Sahib" as Sikhism's primary scripture and eternal Guru.

Question: Who is Fateh Singh (Sikhism)'s paternal grandfather?
Answer: Guru Tegh Bahadur