Cato de Jong was the daughter of Jacob de Jong and Henderina van der Klei. She had three sisters, among whom Geilina Saartje. Addition of a visitor of the website
In addition, a Jokos file (number 18540) 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 6495/1629).