Check the information Open Archives has about Van Velthuizen.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Van Velthuizen.
The Family tree Jonker publication was prepared by Hendrik Willem Jonker (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Hendrik Willem Jonker, "Family tree Jonker", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-jonker/I596.php : accessed January 12, 2026), "Jan van Velthuizen".
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