Simon Dekker was a son of Marks Dekker and Rebecca Sousa. He was previously married. This marriage was dissolved in 1936 by a divorce.
Stadsarchief Amsterdam, archiefkaart Simon Dekker
In addition, a Jokos file (number 52784) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.