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Son of Pieter Joseph Michiel Janssen and Anna Maria Josephina Urlings Brother of Maria Michiel Joseph Hubert Janssen; Maria Margaretha Catharina Constanci Janssen; Louis Poophyn Alphons Antoine Janssen; Jan Nicolaas Constant Marie Janssen; Konstant Servaas Louis Janssen and 1 other; and Constant Joseph Hubert Janssen « less