Jozef Blein was married to Clara Helena Os. He and his wife had a son Henri, who was known as Hans.
I. Cornelissen, Ode aan een slecht mens. Oom Jopie uit de mediene (Amsterdam 1991) foto-katern tussen 48 and 49
Clara Helena Os and Jozef Blein were divorced.
Addition of a visitor of the website
In addition, a Jokos file (number 10407) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.