Isidore Eduard Kaas, born 30 May 1900 in Amsterdam, was a son of Joël Kaas and Schoontje Wolf Beffie. On 26 July 1920 he arrived in Den Haag, still unmarried and worked there as foreman in a tobacco factory. He lived at Van Speijkstraat 120 but left for Amsterdam again on 17 May 1921, where he came living at Muidergracht 79.
In 1935 he returned to Den Haag and in the meantime had a job there as of…