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Son of Jakub Gierszewski and Marcjanna Gierszewska Brother of Jan Gierszewski; Tomasz "Thomas" Gierszewski; Marianna Gierszewska; Walenty Gierszewski; Karol Gierszewski and 1 other; and Franciszek Gierszewski « less Half brother of Kazimierz "Charles" Gierszewski; Franciszek Gierszewski; Andrzej "Andrew" Gerszewski and August Gierszewski