I am searching for information about my father, Boris Kogan's family. He was born May 18, 1904 in St. Petersburg to Zinovy (or Solomon?) Kogan and Nadezhda (Nadine) Zaslavsky. Zinovy was born in Kherson, Ukraine in 1877 to Solomon Kogan and Jany Bassa and Nadezhda in Nikolaev, Ukraine in 1879. They were married in 1901 in Wiesbaden, Germany and then went to St. Petersburg. Zinovy was a professional violinist and orchestral conductor and they emigrated to the U.S. in 1928/29. I believe he had one sister, Elizabeth who was a singer and who also emigrated to the U.S. and a brother but I don't know his name or what became of him. If any of this sounds familiar to anyone, please contact me. Thank you.