artist K.A. Somov

[natasha petersen]

HELP

The artist Kostantin Andreevich Somov had an aunt Lida Ivanovna, uncles - Osip, Aleksei, Mihail and his father named Andrei, who was curator of the Hermitage.  I need to find out about his uncle Mihail - whom did he marry, when, names of his children, and date of death.  I know that Tamara Nikiforova wrote a biography of Osip I. Somov, basing much of her information on the notes of Anna Andreevna Somova, the sister of Konstantin Ivanovich Somov --" The family archive of the son of  Anna Andreevna Somova, the artist E. S. Mihailov". (Semeinii arhiv sina A.A. Somovoi, hudozhnika E. C. Mihailova) Where would I be able to find this family archive?
The biographies that I have read about the artist Kostantin and his family do not mention whom Mihail married, his children, and when and where he died.
Any information would be very welcome.
Osip Ivanovich
Aleksei Ivanovich
Lida Ivanovna
Mihail Ivanovich
Andrei Ivanovich - father of artist Konstantin

Andrei Ivanovich had son Konstantin
                                       daughter Anna - Married Mihailov, and had a son E.S. Mihailov
Natasha 

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