Question: When did Mohammad Hassan Mirza Ii's father die?

Knowledge 1: Mohammad Hassan Mirza II
Prince Mohammad Hassan Mirza II Qajar (also known as Mickey Kadjar) (born July 18, 1949) is the son of Hamid Mirza and a grandson of Mohammad Hassan Mirza, the last Crown Prince of Iran from the rule of the Qajar dynasty.As heir apparent, he is considered the Qajar pretender to the Sun Throne.He currently lives in Dallas, Texas, in the United States.He married Shahnaz Khanum ("née" Sokhansanj; born in 1954).They have one son and two daughters: [SEP] Knowledge 2: Hamid Mirza
Prince Sultan Hamid Mirza Qajar (23 April 1918 – 5 May 1988) was the head and heir presumptive of the Qajar dynasty, the former ruling dynasty of Iran, and the son of the last Qajar Crown Prince of Iran.
Knowledge 1: Mohammad Hassan Mirza II
Prince Mohammad Hassan Mirza II Qajar (also known as Mickey Kadjar) (born July 18, 1949) is the son of Hamid Mirza and a grandson of Mohammad Hassan Mirza, the last Crown Prince of Iran from the rule of the Qajar dynasty.As heir apparent, he is considered the Qajar pretender to the Sun Throne.He currently lives in Dallas, Texas, in the United States.He married Shahnaz Khanum ("née" Sokhansanj; born in 1954).They have one son and two daughters: [SEP] Knowledge 2: Ali Mirza Qajar
Prince Soltan Ali Mirza Kadjar (Qajar) (November 16, 1929 – May 27, 2011) was an Iranian Prince of Qajar Dynasty and the son of Soltan Majid Mirza Qajar (1907–1975) and Homadokht Kian (Shayesteh Khanoum)(1912–1992) and the grandson of Mohammad Ali Shah Qajar.He was the Head of the Qajar Imperial Family.Despite Soltan Ali Mirza Qajar being Head of the Qajar Imperial Family, the Qajar claimant to the Sun Throne was the Heir Presumptive Mohammad Hassan Mirza II, son of Soltan Hamid Mirza and grandson of Soltan Ahmad Shah's brother and successor in exile, Mohammad Hassan Mirza Qajar."Kaanoun-e Khanevadegi-e Ghajar" (after 1999 Kadjar Family Association also named Qajar Family Association: KFA/QFA) was founded in Tehran under the presidency of Nosrat-os-Saltaneh son of Mozaffar al-Din Shah and Yamin-ed-Dowleh son of Naser al-Din Shah.It was dissolved two years after its founding.In 1999 under the presidency of Prince Soltan Ali Mirza this reconstituted association was brought to life by Prof. Manoutchehr Eskandari-Qajar (Santa Barbara City College) and Leo Barjesteh, who, together with Prof. M. Tehranian (then University of Hawaii), also founded the International Qajar Studies Association, of which Soltan Ali Mirza Qajar was the honorary president.Soltan Ali Mirza was a Barrister at Law from France and resided in Paris, France.He is the author of "Les Rois oubliés".Soltan Ali Mirza Qajar died on May 27, 2011 in Paris.Shortly before his death he donated his collection of Qajar manuscripts and photographs to the Qajar Studies and Documentation Centre, housed at the International Institute of Social History in Amsterdam, the Netherlands and partly exhibited at the International Museum for Family History in Eijsden, the Netherlands.
Knowledge 1: Hamid Mirza
Prince Sultan Hamid Mirza Qajar (23 April 1918 – 5 May 1988) was the head and heir presumptive of the Qajar dynasty, the former ruling dynasty of Iran, and the son of the last Qajar Crown Prince of Iran. [SEP] Knowledge 2: Ali Mirza Qajar
Prince Soltan Ali Mirza Kadjar (Qajar) (November 16, 1929 – May 27, 2011) was an Iranian Prince of Qajar Dynasty and the son of Soltan Majid Mirza Qajar (1907–1975) and Homadokht Kian (Shayesteh Khanoum)(1912–1992) and the grandson of Mohammad Ali Shah Qajar.He was the Head of the Qajar Imperial Family.Despite Soltan Ali Mirza Qajar being Head of the Qajar Imperial Family, the Qajar claimant to the Sun Throne was the Heir Presumptive Mohammad Hassan Mirza II, son of Soltan Hamid Mirza and grandson of Soltan Ahmad Shah's brother and successor in exile, Mohammad Hassan Mirza Qajar."Kaanoun-e Khanevadegi-e Ghajar" (after 1999 Kadjar Family Association also named Qajar Family Association: KFA/QFA) was founded in Tehran under the presidency of Nosrat-os-Saltaneh son of Mozaffar al-Din Shah and Yamin-ed-Dowleh son of Naser al-Din Shah.It was dissolved two years after its founding.In 1999 under the presidency of Prince Soltan Ali Mirza this reconstituted association was brought to life by Prof. Manoutchehr Eskandari-Qajar (Santa Barbara City College) and Leo Barjesteh, who, together with Prof. M. Tehranian (then University of Hawaii), also founded the International Qajar Studies Association, of which Soltan Ali Mirza Qajar was the honorary president.Soltan Ali Mirza was a Barrister at Law from France and resided in Paris, France.He is the author of "Les Rois oubliés".Soltan Ali Mirza Qajar died on May 27, 2011 in Paris.Shortly before his death he donated his collection of Qajar manuscripts and photographs to the Qajar Studies and Documentation Centre, housed at the International Institute of Social History in Amsterdam, the Netherlands and partly exhibited at the International Museum for Family History in Eijsden, the Netherlands.

Answer: 5 May 1988