Bernard van Gelder was a son of Gabriel van Gelder and Jannetta Neeltje Lobensteijn. His father married her in Amsterdam on 1 September 1920 and had four children with her. After she passed away there on 11 January 1941, he remarried on 6 November 1941 in Amsterdam to Judic van Coevorden.
City Archive of Amsterdam, archive card of Gabriel van Gelder, Bernard van Gelder and family registration car…