Jacob Roos was a diamond cutter. He got married on 24 March 1898 in Amsterdam with Antje Hartogs. She died on 14 October 1941 in Amsterdam. The couple had four children.
R. de Leeuw van Weenen-van der Hoek, Een kille in de mediene. Joods leven in Zuidland (Zuidland, 1994) 143
In addition, a Jokos file (number 12274) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for looted securities or bonds. (W-claim, number Osp17/1811).