Question: What is the date of death of Prince Michel Of Bourbon-Parma's mother?

Knowledge 1: Prince Michel of Bourbon-Parma
Prince Michel of Bourbon-Parma (Michel Marie Xavier WaldemarGeorg Robert Karl Eymar; 4 March 1926 – 7 July 2018) was a French businessman, soldier and racing car driver, who was a member of deposed sovereign ducal House of Bourbon-Parma.He was a son of Prince René of Bourbon-Parma and his wife Princess Margaret of Denmark.Paternally, he was a grandson of Robert I, Duke of Parma (1848–1907), while through his mother he was a great-grandson of Christian IX of Denmark.Prince Michel was also the younger brother of Queen Anne of Romania. [SEP] Knowledge 2: Princess Margaret of Denmark
Princess Margaret of Denmark(Margrethe Françoise Louise Marie Helene; 17 September 1895 – 18 September 1992) was a Danish princess by birth and a princess of Bourbon-Parma as the wife of Prince René of Bourbon-Parma.She was the youngest grandchild of Christian IX of Denmark and Queen Louise.
Knowledge 1: Prince Michel of Bourbon-Parma
Prince Michel of Bourbon-Parma (Michel Marie Xavier WaldemarGeorg Robert Karl Eymar; 4 March 1926 – 7 July 2018) was a French businessman, soldier and racing car driver, who was a member of deposed sovereign ducal House of Bourbon-Parma.He was a son of Prince René of Bourbon-Parma and his wife Princess Margaret of Denmark.Paternally, he was a grandson of Robert I, Duke of Parma (1848–1907), while through his mother he was a great-grandson of Christian IX of Denmark.Prince Michel was also the younger brother of Queen Anne of Romania. [SEP] Knowledge 2: Princess Margarita, Countess of Colorno
Princess Margarita Maria Beatriz of Bourbon-Parma, Countess of Colorno (born 13 October 1972), is the eldest daughter of Princess Irene of the Netherlands and Carlos Hugo, Duke of Parma, and is member of the Royal and Ducal House of Bourbon-Parma, as well of the Dutch Royal Family.
Knowledge 1: Prince Michel of Bourbon-Parma
Prince Michel of Bourbon-Parma (Michel Marie Xavier WaldemarGeorg Robert Karl Eymar; 4 March 1926 – 7 July 2018) was a French businessman, soldier and racing car driver, who was a member of deposed sovereign ducal House of Bourbon-Parma.He was a son of Prince René of Bourbon-Parma and his wife Princess Margaret of Denmark.Paternally, he was a grandson of Robert I, Duke of Parma (1848–1907), while through his mother he was a great-grandson of Christian IX of Denmark.Prince Michel was also the younger brother of Queen Anne of Romania. [SEP] Knowledge 2: Archduchess Maria Anna of Austria (1882–1940)
Archduchess" Maria Anna" Isabelle Epiphanie Eugenie Gabriele of Austria, full German name:" Maria Anna Isabelle Epiphanie Eugenie Gabriele, Erzherzogin von Österreich"( 6 January 1882, Linz, Upper Austria, Austria – Hungary – 25 February 1940, Lausanne, Vaud, Switzerland) was a member of the Teschen branch of the House of Habsburg- Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth.Through her marriage to Prince Elias of Bourbon- Parma( later Duke of Parma), Maria Anna was also a member of the House of Bourbon- Parma and a Princess of Bourbon- Parma.

Answer: 18 September 1992