In 1928 his grandfather
George was adopted by his uncle and the head of the House of Mecklenburg-Strelitz,
Duke Charles Michael. His grandfather subsequently assumed the title of Duke of Mecklenburg with the style
Serene Highness which was confirmed on 18 July 1929 by the head of the
Imperial House of Russia,
Grand Duke Cyril Vladimirovich and then recognised on 23 December by the former
Grand Duke Frederick Francis IV of Mecklenburg-Schwerin. On 18 December 1950,
Hereditary Grand Duke Friedrich Franz of Mecklenburg-Schwerin confirmed the ducal title and also granted the style
Highness, which in conjunction with the title, is the style enjoyed by
dynastic members of the House of Mecklenburg. His grandfather was also confirmed as head of the house. Duke Borwin succeeded as head of the House of Mecklenburg-Strelitz following his father's death on 26 January 1996. He has also served on the
Almanach de Gotha's Comité de Patronage. In 2005 Duke Borwin along with the head of the
House of Hohenzollern,
Georg Friedrich, Prince of Prussia attended the seasonal opening of
Hohenzieritz Castle in
Mecklenburg-Vorpommern. It was the castle where
Louise of Mecklenburg-Strelitz, who married
Frederick William III of Prussia and became Queen of Prussia, died in 1810. ==Marriage and children==