Jakob van Kleef and his spouse Kaatje van Kleef-Flesschedrage standing before their home at Meerhuizenplein in Amsterdam, and in the window their son Joseph van Kleef.
In addition, a Jokos file (number 50751) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.