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One of the sons married into Karzinkin[ru] family?
Inline citations
Third son N. F.? Nikolai? Nikolai Mering owned estate in Rotmistrovka[ru] in 1900 («Список населенных мест Киевской губернии». Киев: Типография Ивановой, 1900.)
Son Michael married Witte's adopted daughter Sofia Sergeevna (Spiridonova), after bankruptcy run away to Berlin? Son Michael M. (Nov 18th 1901-?, archive record 19-126-1545 28), born abroad, became victim of Stalin's repressions
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