Question: Who is the paternal grandfather of Ajit Singh (Sikhism)?

Knowledge 1: 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. [SEP] Knowledge 2: 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.
Knowledge 1: 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. [SEP] Knowledge 2: Ajit Singh of Khetri
Ajit Singh or Maharaja Ajit Singh Bahadur (16 October 1861 — 18 January 1901) was a ruler of Shekhawat dynasty of the Indian princely state of Khetri, Rajasthan between 1870 and 1901.He was born on 16 October 1861 in Alsisar, India.His father was Thakur Chattu Singh, a resident of Alsisar.Ajit Singh was later adopted to Khetri and after the death of Fateh Singh, he became the eighth king of Khetri in 1870.In 1876 he married Rani Champawatiji Sahiba and the couple had one son and two daughters.He died on 18 January 1901 at Sikandra, and was cremated at Mathura.Ajit Singh was a close friend and disciple of Swami Vivekananda.Swami Vivekananda went to Khetri and met Ajit Singh thrice in his lifetime— in 1891, 1893 and 1897.Ajit Singh is known for providing financial support to Vivekananda, and encouraging him to speak at the Parliament of the World's Religions at Chicago in 1893.From 1891 Ajit Singh started sending monthly stipend of 100 to Vivekanada's family in Kolkata.On 1 December 1898 Vivekananda wrote a letter to Ajit Singh from Belur in which he requested him to make the donation permanent so that even after Vivekananda's death his mother (Bhuvaneswari Devi 1841—1911) gets the financial assistance on regular basis.The letter archive of Khetri reveals he had frequent communication with the family members of Vivekananda.
Knowledge 1: 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. [SEP] Knowledge 2: Ajit Singh of Khetri
Ajit Singh or Maharaja Ajit Singh Bahadur (16 October 1861 — 18 January 1901) was a ruler of Shekhawat dynasty of the Indian princely state of Khetri, Rajasthan between 1870 and 1901.He was born on 16 October 1861 in Alsisar, India.His father was Thakur Chattu Singh, a resident of Alsisar.Ajit Singh was later adopted to Khetri and after the death of Fateh Singh, he became the eighth king of Khetri in 1870.In 1876 he married Rani Champawatiji Sahiba and the couple had one son and two daughters.He died on 18 January 1901 at Sikandra, and was cremated at Mathura.Ajit Singh was a close friend and disciple of Swami Vivekananda.Swami Vivekananda went to Khetri and met Ajit Singh thrice in his lifetime— in 1891, 1893 and 1897.Ajit Singh is known for providing financial support to Vivekananda, and encouraging him to speak at the Parliament of the World's Religions at Chicago in 1893.From 1891 Ajit Singh started sending monthly stipend of 100 to Vivekanada's family in Kolkata.On 1 December 1898 Vivekananda wrote a letter to Ajit Singh from Belur in which he requested him to make the donation permanent so that even after Vivekananda's death his mother (Bhuvaneswari Devi 1841—1911) gets the financial assistance on regular basis.The letter archive of Khetri reveals he had frequent communication with the family members of Vivekananda.

Answer: Guru Tegh Bahadur