Princess Charlotte of Prussia (1831–1855)
Princess Charlotte of Prussia( 21 June 1831 – 30 March 1855), was by birth a Princess of Prussia and member of the House of Hohenzollern and by marriage Hereditary Princess of Saxe- Meiningen.
She was the eldest child and daughter of Prince Albert of Prussia( younger son of Frederick William III of Prussia and Louise of Mecklenburg- Strelitz) and his first wife Princess Marianne of the Netherlands( daughter of William I of the Netherlands and Wilhelmine of Prussia).
Prince Waldemar of Prussia (1868–1879)
Prince Joachim Friedrich Ernst Waldemar of Prussia (10 February 1868 – 27 March 1879) was the sixth child and youngest son of Crown Prince Friedrich (later Emperor Friedrich III), and Victoria, Princess Royal, the eldest daughter of the Queen Victoria.
Princess Elisabeth of Prussia
Princess Elisabeth of Prussia( 18 June 1815 – 21 March 1885) was the second daughter of Prince Wilhelm of Prussia and Landgravine Marie Anna of Hesse- Homburg and a granddaughter of Frederick William II of Prussia.
Prince Philip, Duke of Edinburgh is her great- great- grandson.
Victoria, Princess Royal
Victoria, Princess Royal
(Victoria Adelaide Mary Louisa; 21 November 1840 – 5 August 1901) was German Empress and Queen of Prussia by marriage to German Emperor Frederick III.
She was the eldest child of Queen Victoria of the United Kingdom and Prince Albert of Saxe-Coburg and Gotha, and was created Princess Royal in 1841.
She was the mother of Wilhelm II, German Emperor.
Educated by her father in a politically liberal environment, Victoria was betrothed at the age of sixteen to Prince Frederick of Prussia and supported him in his views that Prussia and the later German Empire should become a constitutional monarchy on the British model.
Criticised for this attitude and for her English origins, Victoria suffered ostracism by the Hohenzollerns and the Berlin court.
This isolation increased after the rise to power of Otto von Bismarck (one of her most staunch political opponents) in 1862.
Victoria was empress for only a few months, during which she had opportunity to influence the policy of the German Empire.
Frederick III died in 1888 – just 99 days after his accession – from laryngeal cancer and was succeeded by their son William II, who had much more conservative views than his parents.
After her husband's death, she became widely known as Empress Frederick (German: "Kaiserin Friedrich").
The empress dowager then settled in Kronberg im Taunus, where she built Friedrichshof, a castle, named in honour of her late husband.
Increasingly isolated after the weddings of her younger daughters, Victoria died of breast cancer on 5 August 1901, not long after her mother's death on 22 January 1901.
The correspondence between Victoria and her parents has been preserved almost completely: 3,777 letters from Queen Victoria to her eldest daughter, and about 4,000 letters from the empress to her mother are preserved and catalogued.
These give a detailed insight into the life of the Prussian court between 1858 and 1900.
Waldemar of Sweden (disambiguation)
Waldemar of Sweden- Swedish:" Valdemar"- may refer to:
Sophie, Princess of Prussia
Sophie Johanna Maria, Princess of Prussia( née" Princess of Isenburg", born 7 March 1978) is the wife of Georg Friedrich, Prince of Prussia, head of the House of Hohenzollern, members of which reigned as kings of Prussia and as German emperors until deposed in 1918.
Christian of Oliva
Christian of Oliva, also Christian of Prussia( died 4 December 1245) was the first missionary bishop of Prussia.
Prince Waldemar of Prussia (1889–1945)
Prince Waldemar William Louis Frederick Victor of Prussia( 20 March 1889 at Kiel – 2 May 1945 at Tutzing, Bavaria) was the eldest son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine.
Princess Eleonore of Schaumburg-Lippe
Princess Eleonore- Christine of Schaumburg- Lippe( Eleonore- Christine Eugenie Benita Feodora Maria; born 22 December 1978 at Hørsholm, Denmark) is the daughter of Prince Waldemar of Schaumburg- Lippe and his first wife, Anne- Lise Johansen.
Princess Eleonore- Christine is a great- great- granddaughter of King Frederick VIII of Denmark.
He is in the line of succession to the British throne as a descendant of George II of the United Kingdom's daughter Queen Caroline Matilda of Denmark and Norway.
Princess Calixta of Lippe
Princess "Calixta" Agnes Adelaide Irmgard Helene Caroline Elise Emma of Lippe (14 October 1895 - 15 December 1982) was the wife of Prince Waldemar of Prussia, eldest son of Prince Henry of Prussia.

Question: What is the cause of death of Prince Waldemar Of Prussia (1868–1879)'s mother?
Answer: breast cancer