Jacob Muller was the son of Izaak Muller and Dina Berg. He was first married to Mijntje Jesayes. The couple had one child: Izaak Mozes. After Mijntje Jesayes had died Jacob Muller got married to Bruintje Hollander in 1942.
Stadsarchief (Municipal Archives) Amsterdam, file card of Jacob Muller
In addition, a Jokos file (number 13971) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.