My grandmother, Ilse Cohn, died on 29 November 1941. No, that’s not quite right. She was murdered – shot by a Nazi execution squad on the edge of a huge burial pit on the outskirts of Kaunas in Lithuania. Last Sunday, as I opened my copy of the Observer, I found myself staring at the heart-stopping photographs of German Jews in the city of Breslau, now Wroc?aw in Poland, who had been rounded up to await deportation. Breslau was my grandmother’s home town. All but one of the photos, which have only recently come to light, were taken on the...