Besides the children mentioned here Izaak de Jongh and Judic Blits had a daughter Lea.
Stadsarchief Amsterdam, gezinskaart Izaak de Jongh
In addition, Jokos files (numbers 10575, 50047) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.