Sara Walvis was unmarried and she lived at the address of her parents, Hartog Walvis and Rosette van Beetz. City Archive of Amsterdam, archive card of Sara Walvis.
In addition, Jokos files (numbers 9132, 4444) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos files reveal that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 4240/21715).