Who was the mother of XXX?
Prince George William of Hanover
Prince George William of Hanover (Georg Wilhelm Ernst August Friedrich Axel Prinz von Hannover), Duke of Brunswick-Lüneburg (25 March 1915 -- 8 January 2006) was the second eldest son of Ernest Augustus III, 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.