Isaak van Gelder was the son of Israël van Gelder and Kaatje Weinberg.
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The mayor of Voorst requested that Isaak van Gelder and his wife Marie van Gelder-Mozes be located, detained and brought to trial. They resided in Voorst and were suspected of having changed their place of residence without the required authorization. This description referred to Jews who had gone into hiding.
Algemeen Politieblad, nr 47, 26 November 1942, 1316, notice 2861
In addition, a Jokos file (number 13108) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.