Johanna Hilversum was a daughter of Manuel Hilversum and Grietje Frank. She married 20 March 1929 in Amsterdam to Jacob Schaap, a son of Abraham Schaap and Aaltje Bromet.
Beside the deceased baby-sister, all other siblings have been killed during the Holocaust: she self, Johanna, Clara, Salomon, Len…
In addition, a Jokos file (number 17535) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.