Jozef van Gelder was the son of Meijer van Gelder and Vroukje van Dantzig. He married to Hanna Polak, daughter of Machiel Polak and Esther Viool, on 10 January 1924 in Amsterdam.
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In addition, a Jokos file (number 7372) 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 3815/3878).