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Son of Willem Daniel Jonker and Helena Dorothea Jonker Brother of Adolph Jacobus Jonker; Johannes Gerhardus Jonker; Willem Daniel Jonker; Marthinus Frederik Roelof Jonker; Petronella Johanna Jonker and 4 others; Magdalena Maria Johanna Petronella Jonker; Helena Dorothea Maria Wagener; Anna Margaretha Jonker and Petronella Johanna Wagener « less