Jacob Roos was the son of Hein Roos and Amalia Rosenberg. He married Mietje Themans, the daughter of Hartog Themans and Rebekka Koopman. Addition of a visitor of the website
In addition, a Jokos file (number 9288) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.