- Ilse was one of four children born to a Dutch-Jewish father and a German-Jewish mother. In 1924 she married Franz Ledermann, a successful lawyer who was 15 years her senior. The couple made their home in Berlin, where they raised two daughters, Barbara and Susanne.
- Daughter of Hendrik Roelof Citroen and Ellen Citroen.
- Sister of Roelof (Paul) Citroen; Charlotte Lena Pauline Hendrik Citroen and Hanan Aron Cidor.
- On June 20, 1943, Ilse was deported to the Westerbork camp in the Netherlands. In 1944 she was sent to Auschwitz, where she perished. Ilse was 40 years old.
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