Question: Who is Montague Isidore Gluckstein's paternal grandfather?
Sentence (from "Montague Isidore Gluckstein"): Major Montague Isidore Gluckstein, OBE, (1886–1958) was chairman of J. Lyons and Co. from 1950 to 1956, when he was succeeded by Isidore Montague Gluckstein.
Relevant evidence: No