Oscar Marx and Jetta Gruneberg married in 1905 in Aken. They had three children, among whom Celine.
Stadsarchief Amsterdam, archiefkaart Oscar Markx
In addition, a Jokos file (number 9429) 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 8033/1677).