Johan Eduard Barnstijn was a son of Bernhard Barnstijn and Helena Cahen. He married Berendina Wilhelmina Trompetter in Amsterdam on 1 October 1930, a daughter of Simon Trompetter and Geesje Vogelzang. Berendina was previously married but divorced from her first husband. She had a daughter from that marriage, born 20 January 1922 in Den Haag. Berendina and Johan Eduard Barnstijn have been divorce too on 21 November 1941 and she and her daughter have survived the Holocaust. Johan Eduard Barnstijn was killed in the Shoah on 31 March 1943, but it is not known where.
Municipal Archive of Den Haag, family registration card of Johan Eduard Barnstijn and website www.wiewaswie.nl