Rosette Ourhaan, a daughter of Juda Ourhaan and Theresia Kleerekoper, was widow of David Hakker since 1 January 1931. He was a son of Jonas Hakker en Sara Kok. Rosette was the 2nd wife of David Hakker and had with him two daughters, Theresa and Rebecca, who both have survived the war.
In addition, a Jokos file (number 40090) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Biography