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In page Elena Kazimirtchak-Polonskaïa:

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In 1936, she married Leon Kazimierczak, an ichthyologist at Warsaw University, and in May 1937, their son Sergei (named after Sergei Bulgakov) was born. During World War II, she worked as senior scientist at the Department of Astronomy in Lviv and moved to Warsaw in 1944. During the Warsaw Uprising in 1944, she became separated from her husband who was brought to a camp near Vienna as war prisoner. In 1945, she made a very bold and crucial decision for her later life: As an Orthodox, she decided to return to Russia, although the Soviet Union was totalitarian at that time. She first lived in Kherson (in today's Ukraine) where her son died of meningitis in July 1948.[citation needed]