When copying data from this family tree, please include a reference to the origin: Kees Helmich, "Family tree Helmich", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-helmich/I27293.php : accessed January 26, 2026), "Euphemia Wilhelmina Josephina Plechelma "Femie" Koekkoek (1944-2008)".
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