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Son of Gen. Fredrik Leopold Grenquist and Adelaide Emilia Avenarius Brother of Henriette Louise Johanna Grénquist; Emelie Leopoldine Grénquist; Adelaide Louise Emilie Soisalon-Soininen; Hedvig Lovisa Grénquist and Sofie Emilie Grénquist Half brother of Carl Woldemar Grénquist and Fredrik Wilhelm Grénquist