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/I6833.php : accessed February 13, 2026), "Willem van Assendelft (????-1412)".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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