Early life. Prince Andrew was born at the Tatoi Palace just north of Athens on 2 February 1882, the fourth son of George I of Greece.A member of the House of Schleswig-Holstein-Sonderburg-Glücksburg, he was a prince of both Greece and Denmark, as his father was a younger son of Christian IX of Denmark.
The Duke of Clarence's full style, as proclaimed at his funeral by Garter King of Arms, was: "[the] Most High, Mighty, and Illustrious Prince Albert Victor Christian Edward, Duke of Clarence and Avondale, Earl of Athlone, Duke of Saxony, Prince of Saxe-Coburg and Gotha, Knight of the Most Noble Order of the Garter, Knight of the Most Illustrious Order of Saint Patrick".
Philipp, Landgrave of Hesse (1896–1980), twin with his brother Wolfgang; married Princess Mafalda of Savoy (1902–1944, Buchenwald), daughter of King Victor Emmanuel III of Italy and had issue. Prince Wolfgang of Hesse (1896–1989), twin with his brother Philipp. He was the designated Crown Prince of Finland officially until 14 December 1918.
Prince Wolfgang of Hesse-Kassel (or Hesse-Cassel) (Wolfgang Moritz; 6 November 1896 – 12 July 1989) was the designated Hereditary Prince of the monarchy of Finland (with the irredentist pretension to Estonia ), and as such, already called the Crown Prince of Finland officially until 14 December 1918, and also afterwards by some monarchists.
In 1891, Prince Christian lost an eye when he was accidentally shot in the face by his brother-in-law, The Duke of Connaught, during a shooting party at Sandringham.  Prince and Princess Christian of Schleswig-Holstein, as they were known, made their home at Frogmore House in the grounds of Windsor Castle and later at Cumberland Lodge in Windsor Great Park .
Prince Christian was raised with his siblings in the royal household in Copenhagen, and grew up between his parents' residence in Copenhagen, the Frederick VIII's Palace, an 18th century palace which forms part of the Amalienborg Palace complex in central Copenhagen, and their country residence, the Charlottenlund Palace, located by the coastline of the Øresund strait north of the city.
Christian IX was born on 8 April 1818 at the residence of his maternal grandparents, Gottorf Castle, near the town of Schleswig in the Duchy of Schleswig. Born as a prince of Schleswig-Holstein-Sonderburg-Beck, he was the fourth son of Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Beck, and Princess Louise Caroline of Hesse-Kassel.