Addition

Joel Jas and his family

Joel Jas and Anna van Kleef married in 1911. They also had a son Joseph.
Stadsarchief Amsterdam, archiefkaart Joel Jas

In addition, a Jokos file (number 50840) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.