Question: What is the date of death of Princess Isabelle Of Orléans (1900–1983)'s father?

Knowledge 1: Princess Isabelle of Orléans (1900–1983)
Princess Isabelle Françoise Hélène Marie d'Orléans (27 November 1900,Le Nouvion-en-Thiérache, France – 12 February 1983, Neuilly-sur-Seine, France) was a member of the House of Orléans and, by marriage, a member of the ducal Harcourt family and of the princely House of Murat.She was one of the four children of Prince Jean, Duke of Guise (1874–1940), who would became the Orleanist pretender to the French throne in 1926, and his wife Princess Isabelle of Orléans.Although born in France, her parents moved the family to Morocco in 1909, then a French colony.She was with her mother and siblings visiting France when World War I broke out in 1914.While her father sought in vain to obtain permission from the French government to serve in the military, the rest of the family hastened back to Morocco. [SEP] Knowledge 2: Prince Jean, Duke of Guise
Prince Jean of Orléans, Duke of Guise(Jean Pierre Clément Marie; 4 September 1874 – 25 August 1940), was the third son and youngest child of Prince Robert, Duke of Chartres (1840–1910), grandson of Prince Ferdinand Philippe and great-grandson of Louis Philippe I, King of the French.His mother was Françoise of Orléans, daughter of François, Prince of Joinville, and Princess Francisca of Brazil.
Knowledge 1: Princess Isabelle of Orléans (1900–1983)
Princess Isabelle Françoise Hélène Marie d'Orléans (27 November 1900,Le Nouvion-en-Thiérache, France – 12 February 1983, Neuilly-sur-Seine, France) was a member of the House of Orléans and, by marriage, a member of the ducal Harcourt family and of the princely House of Murat.She was one of the four children of Prince Jean, Duke of Guise (1874–1940), who would became the Orleanist pretender to the French throne in 1926, and his wife Princess Isabelle of Orléans.Although born in France, her parents moved the family to Morocco in 1909, then a French colony.She was with her mother and siblings visiting France when World War I broke out in 1914.While her father sought in vain to obtain permission from the French government to serve in the military, the rest of the family hastened back to Morocco. [SEP] Knowledge 2: Princess Isabelle of Orléans (1878–1961)
Princess Isabelle of Orléans (Isabelle Marie Laure Mercédès Ferdinande; 7 May 1878 – 21 April 1961) was a member of the French Orleanist royal family and by marriage Duchess of Guise.
Knowledge 1: Princess Isabelle of Orléans (1900–1983)
Princess Isabelle Françoise Hélène Marie d'Orléans (27 November 1900,Le Nouvion-en-Thiérache, France – 12 February 1983, Neuilly-sur-Seine, France) was a member of the House of Orléans and, by marriage, a member of the ducal Harcourt family and of the princely House of Murat.She was one of the four children of Prince Jean, Duke of Guise (1874–1940), who would became the Orleanist pretender to the French throne in 1926, and his wife Princess Isabelle of Orléans.Although born in France, her parents moved the family to Morocco in 1909, then a French colony.She was with her mother and siblings visiting France when World War I broke out in 1914.While her father sought in vain to obtain permission from the French government to serve in the military, the rest of the family hastened back to Morocco. [SEP] Knowledge 2: Prince Jacques, Duke of Orléans
Prince Jacques of Orléans, Duke of Orléans," fils de France"( Jacques Jean Jaroslaw Marie; born 25 June 1941 in Rabat, Morocco), is the son of Henri, Count of Paris( the Orléanist claimant to the French throne from 1940 until his death) and his wife, Princess Isabelle of Orléans- Braganza.

Answer: 25 August 1940