question: Who is Jagat Singh (Raja Of Isarda)'s maternal grandfather?
context: Title: Gayatri Devi
  Passage: Maharani Gayatri Devi (born as Princess Gayatri Devi of Cooch Behar; 23 May 1919 − 29 July 2009), was the third Maharani consort of Jaipur from 1940 to 1949, through her marriage to Maharaja Sawai Man Singh II. Following her husband's signature for the Jaipur State to become part of the Union of India and her step-son's assumption of the title in 1970, she was known as Maharani Gayatri Devi, Rajmata of Jaipur. Ethnically born in a Koch Rajbongshi Hindu family, her father was Maharaja Jitendra Narayan of Cooch Behar in West Bengal, and her mother was Maratha Princess Indira Raje of Baroda, the only daughter of Maharaja Sayajirao Gaekwad III. Following India's independence and the abolition of the princely states, she became a successful politician in the Swatantra Party. Gayatri Devi was also celebrated for her classical beauty and became something of a fashion icon in her adulthood. She served 12 years in congress, during which time she was a prominent critic of Indira Gandhi's government. After her departure from politics, she lived a quiet life in her large estate, spending time with her grandchildren and on hobbies and leisure. She died on 29 July 2009 in Jaipur, at the age of 90. She was suffering from paralytic ileus and a lung infection. She left an estate estimated at nearly half a billion USD, which were passed on to her grandchildren.
  Title: Jagat Singh (raja of Isarda)
  Passage: Jagat Singh was born on 15 October 1949 in Jaipur. He was initially educated in Jaipur and briefly at the Mayo College in Ajmer, then studied at Harrow in the United Kingdom for four years beginning 1963. He catalogued and photographed many of the treasures of the royal palaces. He was later adopted by the childless Raja of Isarda. Jagat Singh's father, Man Singh II, the then ruling Maharaja of Jaipur, was the second son of Thakur Sawai Singh of Isarda, a noble man belonging to the Kachwaha clan of Rajputs. He had been adopted at age of 11 into the royal house of Jaipur to become the Maharaja. His elder brother Bahadur Singh, who succeeded their actual father as Raja of Isarda, remained childless. Bahadur Singh decided to adopt a son of his younger brother, and thus Jagat Singh became the Raja of Isarda. This adoption also made him titular head of the Rajawat sub-clan, as held by Kachwaha custom. On 10 May 1978, Jagat Singh married Mom Rajawongse Priyanandana Rangsit, the younger daughter of Prince Piyarangsit Rangsit and Princess Vibhavadi Rangsit (née Rajani) of Thailand. They had two children; a daughter, Lalitaya Kumari, born in 1979, and a son Devraj Singh, born in 1981. The couple were divorced in 1987. Jagat Singh died in London on 5 February 1997. His chhatri now stands at Gaitore in Jaipur. He was succeeded as titular Raja of Isarda by Devraj Singh. Maharani Gayatri Devi Girls' School in Jaipur has a building called the 'Maharaja Jagat Singh Wing' as a tribute to Jagat Singh. The building is located adjacent to House Of Science.
answer: Jitendra Narayan
citations: Jagat Singh (raja of Isarda) Gayatri Devi