Prince Bernhard of Saxe-Weimar-Eisenach (1878–1900)
Prince Bernhard of Saxe-Weimar-Eisenach ("Bernhard Carl Alexander Hermann Heinrich Wilhelm Oscar Friedrich Franz Peter"; 18 April 1878 – 1 October 1900) was a member of the Grand Ducal House of Saxe-Weimar-Eisenach and a Lieutenant in the Prussian Army.
He bore the titles "Prince of Saxe-Weimar-Eisenach, Duke of Saxony" with the style "Highness".
Ernest Augustus I, Duke of Saxe-Weimar-Eisenach
Ernest Augustus I, Duke of Saxe- Weimar( German:" Ernst August I"; 19 April 1688 – 19 January 1748), was a duke of Saxe- Weimar and, from 1741, of Saxe- Weimar- Eisenach.
Princess Sophie of the Netherlands
Princess Sophie of the Netherlands (Wilhelmine Marie Sophie Louise; 8 April 1824 – 23 March 1897) was the only daughter and last surviving child of King William II of the Netherlands and of his wife Grand Duchess Anna Pavlovna of Russia.
She was heir presumptive to her niece, Queen Wilhelmina of the Netherlands, for seven years, from the death of her brother until her own death.
Ernest Augustus II, Duke of Saxe-Weimar-Eisenach
Ernst August II Konstantin, Duke of Saxe- Weimar- Eisenach( 2 June 1737 – 28 May 1758), was a duke of Saxe- Weimar- Eisenach.
Prince Wilhelm of Saxe-Weimar-Eisenach
Prince Wilhelm Karl Bernhard Hermann of Saxe- Weimar- Eisenach( 21 December 1853 – 15 December 1924) was a member of the House of Saxe- Weimar- Eisenach.
Prince Heinrich XXXIII Reuss of Köstritz
Prince Heinrich XXXIII Reuss of Köstritz (26 July 1879 – 15 November 1942) was the son of Prince Heinrich VII Reuss of Köstritz and his wife Princess Marie Alexandrine of Saxe-Weimar-Eisenach.
Princess Marie of Saxe-Weimar-Eisenach (1808–1877)
Princess Marie of Saxe- Weimar- Eisenach( 3 February 1808 in Weimar – 18 January 1877 in Berlin) was a princess of Saxe- Weimar- Eisenach, by birth, and, by marriage, a princess of Prussia.
She was the daughter of Charles Frederick, Grand Duke of Saxe- Weimar- Eisenach and Grand Duchess Maria Pavlovna of Russia.
Michael, Prince of Saxe-Weimar-Eisenach
Michael, Prince of Saxe- Weimar- Eisenach( born 15 November 1946) is the current head of the Grand Ducal House of Saxe- Weimar- Eisenach, as well as the most senior agnate of the entire House of Wettin.
Princess Marie Alexandrine of Saxe-Weimar-Eisenach
Princess Marie Alexandrine of Saxe-Weimar-Eisenach ("Marie Alexandrine Anne Sophie Auguste Helene";
20 January 1849 – 6 May 1922) was the eldest daughter and second child of Charles Alexander, Grand Duke of Saxe-Weimar-Eisenach and his wife Princess Sophie of the Netherlands.
Through her mother, Marie was second-in-line to the Dutch throne after her nephew William Ernest, Grand Duke of Saxe-Weimar-Eisenach from 1900 to the birth of Princess Juliana in 1909.
As her nephew was expected to abdicate his right to the throne in favor of retaining his title, Marie was expected to directly inherit the Dutch Crown upon the possible death of her still childless cousin Wilhelmina.
The birth of Juliana subsequently changed the succession.
Prince Heinrich XXXII Reuss of Köstritz
Prince Heinrich XXXII Reuss of Köstritz (4 March 1878 – 6 May 1935) was the eldest surviving son of Prince Heinrich VII Reuss of Köstritz and his wife, Princess Marie Alexandrine of Saxe-Weimar-Eisenach.
As Wilhelmina of the Netherlands was childless for the first eight years of her marriage, Heinrich XXXII was third-in-line to the Dutch throne, after the claims of his cousin William Ernest, Grand Duke of Saxe-Weimar-Eisenach and Princess Marie Alexandrine, who was Wilhelmina's cousin, William Ernest's aunt and Heinrich's mother.
William Ernest had made it clear however that he would not give up his title of Grand Duke of Saxe-Weimar-Eisenach if that was a requirement for becoming king of the Netherlands.
Furthermore, Marie Alexandrine was elderly and prone to sickness.
Thus it was assumed that she would give up her claim in favor of her eldest son, Heinrich XXXII.
Consequently, Heinrich was for all intents and purposes the heir presumptive to the Dutch throne until the birth of the future Queen Juliana in 1909.

Question: When did Princess Marie Alexandrine Of Saxe-Weimar-Eisenach's mother die?