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 Leendert van Gelder and Rachel Cohen.