Mozes de Beer married Betsy van Dam on 26 July 1942 in Amsterdam. He then moved in with his parents-in-law.
Stadsarchief Amsterdam, archiefkaart Mozes de Beer
In addition, a Jokos file (number 38533) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.