Salomon Van Gelder was a son of Joseph Leendert van Gelder and Rozetta van Gelder. He married Rachel Cohen in Amsterdam on 26 March 1930, a daughter of Alexander Cohen and Sara van der Sluis.
His siblings were Fogeltje, Hendrina, Leendert and Sander.
City Archive of Amsterdam, archive card of Joseph…
In addition, a Jokos file (number 9157) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.