Betsy van der Horst was the wife of Meijer Heijmans.
Amsterdam municipal archive, Records Jokos, Möbel-claim 52934; property Joods Maatschappelijk Werk
In addition, a Jokos file (number 52934) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.