Check the information Open Archives has about Theunissen.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Theunissen.
The Family tree Doppenberg publication was prepared by Henk Doppenberg (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Henk Doppenberg, "Family tree Doppenberg", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-doppenberg/I1991.php : accessed February 19, 2026), "Aarent Theunissen".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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