Irina Yusupova

Xenia Sheremeteva provided mitochondrial DNA (mDNA) in the 1990s in order to help identify bones recovered in Siberia in 1979 as the remains of Tsar Nicholas II of Russia, who was executed in 1918 along with his wife and children. The test required a female line descendant, as mDNA is passed unchanged from mother to child, unless there is a mutation. In Sheremeteva's case, mDNA from their shared ancestor, Empress Maria Feodorovna, passed to her great-grandmother, Grand Duchess Xenia of Russia, then to her grandmother, Princess Irina of Russia, and then to her mother, Princess Irina Yusopova, and finally to her.

Princess Irina Felixovna Yusupova died on 30 August 1983 at Cormeilles in France. She was buried alongside her paternal grandparents and her parents at the cemetery Sainte-Geneviève-des-Bois Russian Cemetery in Essonne, France).

They had one daughter, Countess Xenia Nikolaevna Sheremeteva, born 1 March 1942 in Rome.

Princess Irina married on 19 June 1938 in Paris, France, Count Nikolai Dmitrievich Sheremetev (28 October 1904, Moscow, Russia – 5 February 1979, Paris, France), son of Count Dmitri Sergeievich Sheremetev and his wife Countess Irina Ilarionovna Vorontsova-Dashkova. His ancestors include Boris Petrovich Sheremetev and Illarion Ivanovich Vorontsov-Dashkov. He worked with the shipping company, Vlasoff. He later contracted tuberculosis, and they moved to Greece for a climate better suited to his condition.

Countess Irina Felixovna Sheremeteva (née Princess Yusupova; Russian: Графиня Ирина Феликсовна Шереметева née Княгиня Юсупова; 21 March 1915, Petrograd, Russian Empire – 30 August 1983), known affectionately as Bébé, was a Russian aristocrat and the only daughter of Prince Felix Yusupov and Princess Irina of Russia.