How did the roles of the past play in Maestro?

Paul eventually learns that Keller's Jewish wife, Mathilde, and his son, Eric, were both imprisoned and killed in a concentration camp. Although Keller is not Jewish, he registers as a Jew after his wife and son's capture and is also sent to a concentration camp, where everyone believes he died. Maestro is haunted by his past. His days are taken up with drinking schnapps and reading newspapers at the beer garden below the room. He is filled with pain and remorse over the deaths of his family and his choices during the war.