Betje Härtz and Willem Velleman married in 1926. The couple had two children. During the war, the family tried to escape the Netherlands. They were, however brought to camp Westerbork on 11 January 1943.
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In addition, a Jokos file (number 11422) 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 12151/13888 12126/15715).