Step-sister of Konstantin and Vladimir Shilovsky (d. 1921), born Mariya Vladimirovna Begicheva (Мария Владимировна Бегичева); known after her marriage as Mariya Vladimirovna Kiseleva (Мария Владимировна Киселева).
Mariya was the daughter of the dramatist Vladimir Begichev (1838–1891); when her father married the composer Mariya Shilovskaya (1830–1879), she became step-sister to the composer's friends Konstantin and Vladimir Shilovsky. Tchaikovsky was introduced to Mariya at the family estate at Glebovo in the spring of 1876.
Correspondence with Tchaikovsky
One letter from Tchaikovsky to Mariya Kiseleva has survived, dating from 1876: