Ella Kussel was a daughter of Philip Kussel and Bertha Cohen. She married Simon Hakkert in Doetinchem on 16 March 1909. He passed away on 27 April 1930 in Amsterdam. Stadsarchief Amsterdam, archiefkaart Ella Kussel
In addition, a Jokos file (number 53761) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.