When copying data from this family tree, please include a reference to the origin: Jaap van der Werff, "Family tree Van der Werff / Kooistra", database, Genealogy Online (https://www.genealogieonline.nl/van-der-werff-stamboom/I525116.php : accessed June 21, 2024), "Tjets van Galama (????-1581)".
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Please stick to the following rules
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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