Prince Friedrich Karl Nikolaus of Prussia (20 March 1828 – 15 June 1885) was the son of Prince Charles of Prussia (1801–1883) and his wife, Princess Marie of Saxe-Weimar-Eisenach (1808–1877). Prince Friedrich Karl was a grandson of King Frederick William III of Prussia and a nephew of Frederick William IV and William I .
Georg Friedrich is the only son of Prince Louis Ferdinand of Prussia (1944–1977) and Countess Donata of Castell-Rüdenhausen (1950–2015).    Born into a mediatised princely family, his mother later became Duchess Donata of Oldenburg when she married secondly Duke Friedrich August of Oldenburg , who had previously been married to her sister-in-law Princess Marie Cécile of Prussia. 
Prince Friedrich Christian Ludwig of Prussia (3 September 1943 – 26 September 1943) Prince Franz Friedrich Christian of Prussia (born 17 October 1944). After the divorce, Prince Karl married, morganatically, Luise Dora Hartmann (5 September 1909 – 23 April 1961) on 9 November 1946. The childless couple divorced in 1959. Prince Karl's last ...
Frederick III (German: Friedrich Wilhelm Nikolaus Karl; 18 October 1831 – 15 June 1888), or Friedrich III, was German Emperor and King of Prussia for 99 days between March and June 1888, during the Year of the Three Emperors.
Prince Francis Frederick Sigismund of Prussia (German: Franz Friedrich Sigismund; 15 September 1864 – 18 June 1866) was the fourth child and third son of Crown Prince Frederick William of Prussia (later King of Prussia and German Emperor as Frederick III), and Victoria, Princess Royal, eldest daughter of the British Queen Victoria.
Prince Frederick George William Christopher of Prussia (German: Friedrich Georg Wilhelm Christoph Prinz von Preußen; 19 December 1911 – 20 April 1966), also known as Friedrich von Preussen in the United Kingdom, was the fourth son of Crown Prince Wilhelm of Germany and Duchess Cecilie of Mecklenburg-Schwerin
Biography. Wilhelm-Karl was the youngest of Prince Oskar of Prussia and Countess Ina Marie von Bassewitz's four children. Having been admitted to the Bailiwick of Brandenburg of the Order of Saint John of the Hospital at Jerusalem (known unofficially as the Johanniterorden, the Protestant successor of the mediaeval Knights Hospitaller) in 1944, he later succeeded his father as its head ...