When copying data from this family tree, please include a reference to the origin: Andre Ottenhoff, "Family tree Ottenhoff - Schilder", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ottenhoff/I24239.php : accessed December 29, 2025), "Johannes Jacobus "Jan" Kok (± 1881-1948)".
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