When copying data from this family tree, please include a reference to the origin: J.H.Douma, "Family tree Douma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-douma/I4968.php : accessed February 20, 2026), "Jan Gerlofs van Oosten (1778-1818)".
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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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