Aaltje Grietje Kropveld was a daughter of Victor Emanuel Kropveld and Rosette Kosses. She married Henri van Geens in 1906 in Amsterdam. Stadsarchief Amsterdam, archiefkaart Aaltje Grietje Kropveld
In addition, a Jokos file (number 7262) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.