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Son of Willem Hendrik Janssen and Anna Maria Knarren Husband of Paulina Anna Maria Vallen Brother of Petronella Elizabeth Janssen; Petronella Elisabeth Janssen; Louisa Antonia Janssen; Johanna Paulina Carolina Janssen; Cornelia Pelagia Janssen and 5 others; Maria Anna Petronella Amelberga Janssen, tweeling; Maria Josephina Hendrica Cecilia Janssen, tweeling; Hendrik Hubert Herman Janssen; Jan Mathijs Hubert Janssen and Julianus Hubertus Gregorius Janssen « less