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Daughter of Petrus Daniel Jonker, b9c7 and Adriana Johanna Catharina Bester, b3c5d1e4 Sister of Michiel Adriaan Jonker, b9c7d1; Helena Christina Jonker; Cornelia Elizabeth Bester, b9c7d3 and Christiaan Jacobus Jonker Half sister of Magdalena Petronella Jonker and Christina Maria Jonker