When copying data from this family tree, please include a reference to the origin: Heidi Jonkman, "Ancestors Jonkman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-jonkman/I923.php : accessed February 22, 2026), "Cornelis Cornelisz. Houckman Alias De Oude (????-< 1639)".
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