When copying data from this family tree, please include a reference to the origin: Rob de Ridder, "Family tree De Ridder / Wolterbeek en aanverwante geslachten", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-ridder-wolterbeek/I518686.php : accessed June 6, 2024), "Bertha Bertroud Gerard van Sterkenborg (± 1250-????)".
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