Borach Sleutelberg was a son of Lazarus Sleutelberg and Ghole Nieweg.
See for further information and a picture: J. Bottema, Ze waren onder ons. 300 jaar joden in Delfzijl 1642-1942 (Delfzijl 1980) 98-99, 123-124.
Borach Sleutelberg died on 15 March 1943 in Westerbork transit camp and he was cremated there on 17 March 1943. The urn with ashes was placed on the jewish cemetry in Diemen on field U…