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/I336547.php : accessed June 22, 2024), "Yttje Piers Spijksma (Spyksma) (± 1765-????)".
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