Matje Spits was the mother of Robert Hoffmann. Josef Posner was married to Jeanette Mindus. He had three children, among whom Emma Posner, from a previous marriage. See for more information on this family: W. Miedema, Niet langer een vreemdelinge: het verhaal van Marga Hoffmann (Hengelo 2008).
In addition, a Jokos file (number 45019) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.