Heijman de Koning and Schoontje Springer married on 30 January 1924 in Rotterdam. The family moved on 17 September 1936 to Pijnacker and
lived on Emmadwarsstraat 40, the current Sophiastraat. On 8 March 1938 the family moved back to Rotterdam, to the Lijnbaanstraat 21 B. The De Koning family, except for the oldest child, arrived in camp Westerbork on 27 February 1943. On 17 March they were deported to Sobibor.
See for more information on the De Koning family: E. van Baarle, Vertrokken zonder nader adres: de joodse inwoners en onderduikers van Pijnacker, 1936 - 1945 (Pijnacker 2005).
In addition, a Jokos file (number 18076) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.