Jacob Casseres was a son of Raphaël Casseres and Roosje Haag. He married in Amsterdam on 22 March 1939 to Rebecca Emden. City Archive of Amsterdam, archive card of Jacob Casseres.
In addition, a Jokos file (number 52651) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.