Izaak Grobfeld, also known as Kropveld, was a butcher and a shopkeeper. In 1909 he purchased a site to build a house in Vlagtwedde. The City of Groningen owned this land and arranged for hereditary tenure. Izaak Grobfeld was married to Hendel Johanna Cohen. The couple lived at Munnekemoer Oost 27 in Ter Apel.
D. Wolf, De kille Ter Apel. Geschiedenis van de Joodse Gemeente Ter Apel (Ter Apel 1998) 15, 19, 86
Izaak Grobfeld and Hendel Johanna Cohen were the parents of Adolf Grobfeld.
Stadsarchief Amsterdam, archiefkaart Adolf Grobfeld
In addition, a Jokos file (number 54403) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 1).