When copying data from this family tree, please include a reference to the origin: Joke Koster, "Family tree Griffioen Jellema Friese Adel", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-griffioen-koster/I261219.php : accessed June 20, 2024), "Jan Jans (Jansen) Sterk (± 1750-1805)".
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