Benjamin van der Sluis was a son of Joseph van der Sluis and Eshter Spaanbroek. His siblings were Simon and Elisabeth, who have survived the Holocaust, Klara, Gerrit, Ephraim, Jaantje, Sientje, Isak, Leentje, and Marcus.
Benjamin married Helena van Tijn in Amsterdam on 10 August 1938, a daugther of …
In addition, a Jokos file (number 1635) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.