Jonas Efraim Cauveren was the widower of Betje -Betsy- van Kollem, who passed away in 1938. They had two children.
Addition of a visitor of the website.
In addition, a Jokos file (number 53945) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for va…