In addition, a Jokos file (number 53082) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Abraham Jas, son of Jacob Jas and Saartje Cohen, was married to Alida Zwalf on 12 Jun 1935 in Amsterdam. On 22 Apr 1937 a daughter, Sonja Marianne, was born to Abraham and Alida.