Henriette Betsy Evaleni Boers and her younger sister Annie, were children from the first marriage of their mother Rosette Behrman and Sally Boers, from whom she has been divorced in 1935. Their father has survived the Holocaust but they have been killed on 23 July 1943 in Sobibor, together with their mother.
City Archive of Amsterdam, archive cards of Rosette Behrman en Sally Boers.