Question: When did the father of Dahyabhai Patel die?

Knowledge 1: Dahyabhai Patel
Dahyabhai Patel (1906–1973) was the son of Indian leader Sardar Vallabhbhai Patel, an and later a member of the Parliament of India. Educated in Bombay, Dahyabhai Patel graduated from the Gujarat Vidyapith and began working for an insurance company, and settled in Bombay. His first wife Yashoda died, leaving him his son Bipin. He later married Bhanumati and had another son, Gautam. His flat on Sandhurst Road and later Prabhadevi in Bombay was the frequent residence of Sardar Patel. Although primarily a businessman, Patel participated in the Quit India movement and was imprisoned from 1942 to 1944. [SEP] Knowledge 2: Vallabhbhai Patel
Vallabhbhai  Patel (31 October 1875 – 15 December 1950), popularly known as Sardar Patel, was an Indian politician. He served as the first Deputy Prime Minister of India. He was an Indian barrister and statesman, a senior leader of the Indian National Congress and a founding father of the Republic of India who played a leading role in the country's struggle for independence and guided its integration into a united, independent nation. In India and elsewhere, he was often called Sardar, meaning "chief" in Hindi, Urdu, and Persian. He acted as Home Minister during the political integration of India and the Indo-Pakistani War of 1947.Patel was raised in the countryside of state of Gujarat. He was a successful lawyer. He subsequently organised peasants from Kheda, Borsad, and Bardoli in Gujarat in non-violent civil disobedience against the British Raj, becoming one of the most influential leaders in Gujarat. He was appointed as the 49th President of Indian National Congress, organising the party for elections in 1934 and 1937 while promoting the Quit India Movement.
Knowledge 1: Dahyabhai Patel
Dahyabhai Patel (1906–1973) was the son of Indian leader Sardar Vallabhbhai Patel, an and later a member of the Parliament of India. Educated in Bombay, Dahyabhai Patel graduated from the Gujarat Vidyapith and began working for an insurance company, and settled in Bombay. His first wife Yashoda died, leaving him his son Bipin. He later married Bhanumati and had another son, Gautam. His flat on Sandhurst Road and later Prabhadevi in Bombay was the frequent residence of Sardar Patel. Although primarily a businessman, Patel participated in the Quit India movement and was imprisoned from 1942 to 1944. [SEP] Knowledge 2: Bardoli Satyagraha
The Bardoli Satyagraha of 1928, in the state of Gujarat, India during the period of the British Raj, was a major episode of civil disobedience and revolt in the Indian Independence Movement. The movement was eventually led by Vallabhbhai Patel, and its success gave rise to Patel becoming one of the main leaders of the independence movement.
Knowledge 1: Dahyabhai Patel
Dahyabhai Patel (1906–1973) was the son of Indian leader Sardar Vallabhbhai Patel, an and later a member of the Parliament of India. Educated in Bombay, Dahyabhai Patel graduated from the Gujarat Vidyapith and began working for an insurance company, and settled in Bombay. His first wife Yashoda died, leaving him his son Bipin. He later married Bhanumati and had another son, Gautam. His flat on Sandhurst Road and later Prabhadevi in Bombay was the frequent residence of Sardar Patel. Although primarily a businessman, Patel participated in the Quit India movement and was imprisoned from 1942 to 1944. [SEP] Knowledge 2: Ketan Mehta
Born in Navsari in Gujarat, Ketan Mehta did his schooling from Sardar Patel Vidyalaya, Delhi and later graduated in film direction from Film and Television Institute of India, Pune.

Answer: 15 December 1950