Izaak Hartog Kisch was married to Reina van Gelder. He was a merchant. They had a son by the name of Leo Jacques. Leo was born in camp Westerbork on 23 November 1942.
Birth certificate register, which was drafted by the auxiliary administrative office of the civil registration in camp Westerbork; Westerbork archives, which are now part of the archives of Midden-Drenthe in Beilen
In addition, a Jokos file (number 15092) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.