Check the information Open Archives has about Janssens.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Janssens.
The Family tree De Keyser publication was prepared by Guido de Keyser (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Guido de Keyser, "Family tree De Keyser", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-keyser/I5218.php : accessed May 31, 2024), "(nn) Janssens nn".
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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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