Willem Koolen⁽¹⁾ was born⁽²⁾ on 10 Sep 1890 in Hulsberg, L. He married⁽³⁾ Maria Catharina Pluymen on 9 Feb 1928 in Hulsberg, L. Willem was employed⁽⁴⁾ as landbouwer.
Maria Catharina Pluymen
Maria Catharina Pluymen⁽¹⁾ was born⁽²⁾ on 18 Sep 1900 in Hulsberg, L. She married⁽³⁾ Willem Koolen on 9 Feb 1928 in Hulsberg, L.