When copying data from this family tree, please include a reference to the origin: Pieter Janssen, "Family tree Janssen-Frencken | van Helden tot Heden", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-janssen-frencken/I6433.php : accessed May 22, 2024), "Gertrudis Onbekend (1620-????)".
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