Niece of the composer (b. March 1883 in Tiflis; d. 26 March 1970 at Juan les Pips, France), born Tatyana Anatolyevna Chaykovskaya (Татьяна Анатольевна Чайковская); during her first marriage she was known as Tatyana Anatolyevna Venevitinova (Татьяна Анатольевна Веневитинова); during her second marriage as Baroness Ungern-Sternberg; and during her third marriage as Mrs Warren Crosse.
Tatyana was the only child of the composer's brother Anatoly Tchaikovsky (1850–1915) and his wife Praskovya (b. Konshina, 1864–1956). She married for the first time to the diplomat Aleksey Vladimirovich Venevitinov (1875–1925), by whom she had three children: Vladimir; Yelena; and Apollinariya. Her second marriage was to Baron Paul Ungern-Sternberg, by whom she had two more children: Margarita, and Maria. She married for the third and final time to the author Felix Warren Crosse (1892–1975).