Who was XXX's father?
Prince Christian Oscar of Hanover
Prince Christian Oscar of Hanover (German: Christian Oskar Ernst August Wilhelm Viktor Georg Heinrich Prinz von Hannover), Prince of Great Britain and Ireland, Duke of Brunswick-Lüneburg (1 September 1919 in Gmunden, Upper Austria, Austria -- 10 December 1981 in Lausanne, Switzerland) was the fourth child of Ernest Augustus, Duke of Brunswick and his wife Princess Victoria Louise of Prussia, the only daughter of Wilhelm II, German Emperor and Augusta Viktoria of Schleswig-Holstein.
Ernest Augustus, Duke of Brunswick