When copying data from this family tree, please include a reference to the origin: I. Schrik-Mulder, "Family tree Mulder, Schrik, Kolkman, Grade, Modderman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-mulder-schrik-kolkman-grade-modderman/I1606.php : accessed June 21, 2024), "Otto Everts Schröder".
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