When copying data from this family tree, please include a reference to the origin: Theodorus Gerardus Marie Koken, "Family tree Theodorus Gerardus Marie Koken", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koken/I406.php : accessed February 27, 2026), "Henricus-Nicolaus(Wilhelmus) Keris".
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