Check the information Open Archives has about Poorthuis.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Poorthuis.
The Family tree Van Willigen publication was prepared by Rob van Willigen (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Rob van Willigen, "Family tree Van Willigen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-willigen/I9904.php : accessed January 19, 2026), "Jannes Poorthuis".
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