Princess Marie of Hohenzollern-Sigmaringen
Princess Marie of Hohenzollern-Sigmaringen, later Princess Marie of Belgium, Countess of Flanders (Marie Luise Alexandrine Karoline; 17 November 1845 – 26 November 1912) was a Princess of Hohenzollern-Sigmaringen, later simply of Hohenzollern, and mother of King Albert I of Belgium.
Pauline Therese of Württemberg
Pauline of Württemberg (4 September 1800 – 10 March 1873) was a daughter of Duke Louis of Württemberg and Princess Henriette of Nassau-Weilburg.
She married her first cousin King William I of Württemberg and was his consort.
Duchess Maria Dorothea of Württemberg
Duchess Maria Dorothea of Württemberg( Maria Dorothea Luise Wilhelmine Caroline; 1 November 1797 in Carlsruhe( now Pokój), Silesia – 30 March 1855 in Pest, Hungary) was the daughter of Duke Louis of Württemberg( 1756 – 1817) and Princess Henriette of Nassau- Weilburg( 1780 – 1857).
Princess Henriette of Belgium
Princess Henriette of Belgium, later Princess Henriette of Orléans, Duchess of Vendôme (30 November 1870 – 28 March 1948), was the daughter of Prince Philippe, Count of Flanders, and Princess Marie of Hohenzollern-Sigmaringen.
She was the younger twin sister of Princess Joséphine Marie of Belgium, who died at the age of six weeks in 1871.
Duchess Elisabeth Alexandrine of Württemberg
Duchess Elisabeth Alexandrine Constance of Württemberg( 27 February 1802 in Würzau, Courland Governorate – 5 December 1864, in Karlsruhe) was a daughter of Duke Louis of Württemberg and Princess Henriette of Nassau- Weilburg.
Princess Henriette of Liechtenstein
Princess Henriette of Liechtenstein( German:" Henriette Maria Norberta, Prinzessin von und zu Liechtenstein"; 6 June 1843 – 24 December 1931) was a Princess of Liechtenstein and member of the Princely House of Liechtenstein.
Prince Leopold, Duke of Brabant
Prince Leopold of Belgium, Duke of Brabant, Count of Hainaut( 12 June 1859 – 22 January 1869), was the second child and only son of King Leopold II of Belgium and his wife, Marie Henriette of Austria, and heir apparent to the Belgian throne.
Princess Louise of Belgium
Princess Louise Marie Amélie of Belgium( 18 February 1858 in Brussels – 1 March 1924 in Wiesbaden) was the eldest daughter of Leopold II and his wife, Marie Henriette of Austria.
Princess Joséphine Marie of Belgium
Princess Joséphine Marie of Belgium( 30 November 1870 — 18 January 1871) was the daughter of Prince Philippe, Count of Flanders, and Princess Marie of Hohenzollern- Sigmaringen.
She was the older twin to Princess Henriette of Belgium.
In 1872 Joséphine Marie's mother gave birth to another daughter, who was named Joséphine in her memory.
Princess Henriette of Schönaich-Carolath
Princess Henriette of Schönaich- Carolath( 25 November 191816 March 1972) was the youngest daughter of Prince Johann George von Schönaich- Carolath and Princess Hermine Reuss of Greiz, who later became the second wife of Wilhelm II, German Emperor.

Question: When is Princess Henriette Of Belgium's mother's birthday?
Answer: 17 November 1845