Check the information Open Archives has about Sijstermans.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Sijstermans.
The Family tree Dovermann publication was prepared by Chir Dovermann (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Chir Dovermann, "Family tree Dovermann", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-dovermann/I33.php : accessed December 29, 2025), "Cornelis Joseph Sijstermans".
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