Jacob Sanders married in 1920 in Rotterdam. He had two children from this marriage. On 1 July 1940 the Sanders family moved from The Hague to Pijnacker. See for more information: E. van Baarle, Vertrokken zonder nader adres: de joodse inwoners en onderduikers van Pijnacker, 1936 - 1945 (Pijnacker 2005).
In addition, a Jokos file (number 52822) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 12034/12242).