According to the death records of camp Sachsenhausen Isaac van Straten died on 10 December 1944. It is possible this date is different from the official day of death as established after the war by the Department of Justice
In addition, a Jokos file (number 2622) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.