According to my grandmother's notes and those of another relative, ( http://gen.scatteredmind.co.uk/show_person/591) Richard was a brother of Albert Gassmann ( http://www.joodsmonument.nl/person/532421) who was also deported from Amsterdam, and had three daughters who probably survived the war.
Richard Gassmann had eleven brothers and sisters.
Addition of a visitor of the website
In addition, a Jokos file (number 53768) 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 …