Joseph Blok was the son of Manuel Blok and Mietje Goudsmit. Joseph Blok grew up in a family with eight children. Both his parents died before the war. Addition of a visitor of the website
In addition, a Jokos file (number 38502) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.