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Son of Matti Viljam Sofianpoika Koskinen and Maria Vilhelmina Koskinen Husband of Saima Aleksandra Koskinen Father of Private and Matti Koskinen Brother of Ida Maria Koskinen; Helmi Aro; Helle Koskinen; Martta Wilhelmina; Lempi Aleksandra and 1 other; and Private « less Half brother of Ida Maria