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Son of Nicolaas Jacobus Posthumus, b3 and Hester Johanna Margaretha Posthumus Husband of Maria Christina Jacomina Margrita Venter Father of Francois Jacobus Posthumus and Jan Jacobus Posthumus Brother of Anna Elizabeth Smith; Hester Johanna Posthumus; Nicolaas Jacobus Posthumus; Johannes Mattheus Posthumus; Johanna Christina Olivier and 3 others; Gert Schalk Posthumus; Helena Susanna Posthumus and Christiaan Jacobus Posthumus « less Half brother of Anna Susanna Dorothea Horn