When copying data from this family tree, please include a reference to the origin: J.H.Douma, "Family tree Douma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-douma/I17063.php : accessed February 18, 2026), "Josina Fredericks (Joost Joest) Gaikinga (Gaykema) (1515-> 1542)".
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