In Bayreuth, 1937
Duchess Woizlawa of Meckenburg-Schwerin, Queen Alexandrine of Denmark, Duke and Duchess Adolf Friedrich of Mecklenburg-Schwerin, Crown Princess Cecilie of Prussia, Princess Cecilie of Prussia, the Crown Princess and Crown Prince of Denmark and DuchessThyra of Mecklenburg-Schwerin.
Queen Alexandrine, Grand Duke Franz Friedrich and Crown Princess Cecilie were siblings. This may have been on the last occasions where all three siblings were together. In 1940, German troops invaded and occupied the country until 1945, following the Allied liberation.
On November 17, 1945, Friedrich Franz died at age 62, eight days after the members of the Royal Air Force's Security group arrested the elderly Grand Duke as a fugitive Nazi. He died in a Flensburg hospital, following an operation. His elder son, Friedrich Franz, was also a member of the Nazi party.