When copying data from this family tree, please include a reference to the origin: Wim Jansen, "Family tree Jansen, Brandsma, Esmeijer, De Waal en Wennekes", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-jansen-brandsma/I9512.php : accessed June 21, 2024), "Gerrit Jan Tijken".
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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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