Oscar Dalsheim was a son of Heijman Dalsheim and Leah Heilbrunn. He had two other brothers: Max and Daniel and a sister Amalia. Two other children died very young. Oscar was not married.
Death certificate 1950 from the website Alle Groningers and the website WiewasWie.
In addition, a Jokos file (number 17584) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization…