Sander van Gelder was a son of Joseph Leendert van Gelder and Rozetta van Gelder. He married Sara Cozijn in Amsterdam on 6 December 1939, a daughter of Abraham Cozijn and Sippora Premseler.
His siblings were Fogeltje, Salomon, Hendrina and Leendert.
City Archive of Amsterdam, archive card of Sander van Gelder and Joseph Leendert van Gelder.
Biography