Head of the Royal House of Prussia, a branch of the House of Hohenzollern, on 26 September 1994. He stated that he learned to appreciate the history and responsibility of his heritage during time spent with his paternal grandfather, who often recounted to him anecdotes from the life in exile of his own grandfather, the last German Kaiser, Wilhelm II. His position as sole heir to the estate of his grandfather was challenged by his uncles, Friedrich Wilhelm and Michael, who filed a lawsuit claiming that, despite their renunciations as dynasts at the time of their marriages, the loss of their inheritance rights based on their selection of spouse was discriminatory and unconstitutional. His uncles were initially successful, the Regional Court of Hechingen and the higher Regional Court of Stuttgart ruling in their favour in 1997 on the grounds that the requirement to marry equally was "immoral". However, the Federal Court of Justice of Germany overturned the original rulings in favour of Georg Friedrich's uncles, the case being remanded to the courts at Hechingen and Stuttgart. This time both courts ruled in favour of Georg Friedrich. His uncles then took their case to the Federal Constitutional Court of Germany which overruled the previous court rulings in Georg Friedrich's favour. On 19 October 2005, a German regional court ruled that Georg Friedrich was indeed the principal heir of his grandfather, Louis Ferdinand (who was the primary beneficiary of the trust set up for the estate of Wilhelm II), but also concluded that each of the children of Louis Ferdinand was entitled to a portion of the Prussian inheritance. Family In 2011 Georg Friedrich married Princess Sophie of Isenburg. The civil wedding took place in Potsdam on 25 August 2011, and the ecumenical religious wedding took place at the Church of Peace in Potsdam on 27 August 2011, in commemoration of the 950th anniversary of the founding of the House of Hohenzollern. The religious wedding was also broadcast live by local public television. On 20 January 2013, Georg Friedrich's wife, Sophie, gave birth to twin sons in Bremen, Carl Friedrich Franz Alexander and Louis Ferdinand Christian Albrecht. Carl Friedrich, the elder of the two, is his father's heir apparent. Their third child, Emma Marie Charlotte Sofia, was born on 2 April 2015. On 17 November 2016, Sophie gave birth to Heinrich Albert Johann Georg, their fourth child. Property claims In mid-2019 it