John Hamme perished in Mauthausen in 1941. His parents and two remaining children of the family Hamme fled in the direction of Switzerland in 1942. They survived the war in hiding in Belgium.
Addition of a visitor of the website.
In addition, a Jokos file (number 1672) on this family 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 valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 4727/14101).