Nathan Plotske and Marianna Klijnkramer married in 1917 in Amsterdam. They had four children: two children who married during the war and survived the war, Benedictus (who died at a young age) and the here mentioned Rosa Elisabeth.
Stadsarchief Amsterdam, archiefkaart Nathan Plotske
In addition, Jokos files (numbers 33614, 33608) 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 9367/9210).
Addition