Although Ralph and Marion were not observant Jews, they were defined by their early life as Jews.
"At first the Germans thought they were being generous to the Jews, allowing us to play," says Anka. "Then they saw how wonderfully the music was played, and presumably had the idea to stage performances, and make films, for the outside world".
In terms of religion, Christians and Jews were more likely to claim an English-only national identity.
Chief among these were the figure of 4 million deaths at Auschwitz (based on contemporary Soviet estimates, but later revised to 1.1m) and the failure to establish that Jews were the central target of Nazi persecution.
Jesus's preaching was predominantly directed at his fellow Jews.
The destructive orgy that ensued left at least 91 Jews murdered, 30,000 arrested, and more than 7,000 Jewish businesses destroyed or damaged over the 9 and 10 of November 1938 in co-ordinated attacks against Jews in Germany and Austria.
It tells the story of an unusual woman, a British-educated, divorced Hungarian doctor who held some negative views about Jews but risked her life to hide a Jewish friend, Irene Lakos, and her friend's seven-year-old nephew.
Some Jews had even fled to Hungary, she explained.
Things got worse after the German occupation started on 19 March 1944: "Jews will have to wear the yellow star from April 5 on," Madi wrote on 31 March.
For my more recent visits to perform there I have felt obliged, for a few reasons, to give all profits from the shows to Israeli charities – those concerned with the co-education of young Jews, Christians and Israeli Arabs.
Almost six centuries after most of them converted to Christianity, a rabbinical court has declared that descendants of a "lost tribe" from the Spanish island of Mallorca can once more be considered Jews.
