Kaatje van Gelder was the sister of Salomon and Kaatje.
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The Arnhem police commissioner requested that Kaatje van Gelder, residing in Arnhem, be located, detained and brought to trial. She was suspected of having changed her place of residence without obtaining the required authorization. This description referred to Jews who had gone into hiding.
Algemeen Politieblad, nr 2, 14 January 1943, 31, notice 120
This person is commemorated on a memorial in Borne. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.