When copying data from this family tree, please include a reference to the origin: C. Matthijssen, "Bosje stambomen Akkerman, Jager, Lammerts en Matthijssen", database, Genealogy Online (https://www.genealogieonline.nl/bosje-stambomen-akkerman-jager-lammerts-en-matthijssen/I873.php : accessed December 24, 2025), "Albert Sikkens of Sickens (1791-1877)".
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