Both of my father's parents had first cousins who were living in Germany during that era. Grandmother was raised in Hamburg and moved to the States when she was nineteen; Grandfather was born and raised in the US but Low German was his first language and he visited his German relatives several times during his youth.
Sometime during the 1930s a big split happened and they never mentioned their European relatives' names again. Even half a century later when I went to Germany and visited the neighborhood where my grandmother had lived (her grade school still stands)--couldn't coax a name out of her.
This stuck out because otherwise the family celebrated our heritage: two of their three children learned to speak German although I was the only grandchild who learned it. Dinner at the grandparents' was often beef rouladen with spaetzle and red cabbage, German folk music (or perhaps Haydn or Mozart), and everybody at the table had a glass of beer. Sometimes they would marinade a roast for three days.
Grandma had detailed recollections of the shootouts in Hamburg that happened during the twenties when the Communists tried to take over the city. She was literally dodging bullets on her way to the subway. She left the country in '27 while the country was still a democracy (an unstable democracy). In her own words, "Hitler was some nut from Bavaria they had thrown into prison." She expected another war but had no idea how bad it would get.
One of the reasons that probably contributed to how complete that family split became was that one of Grandma's brothers converted to Judaism when he married (during the thirties, in New York). The American side of the family stood by him. None of the later generations found out what the German side thought of it; isn't difficult to guess.
The people I met in Germany were more apt to point to a photograph on the wall of some relative who had died during the war--and elderly woman had lost a brother in Stalingrad. "Das war Nazizeit," [that was the Nazi era] she commented without further elaboration. I was staying relatively close to Bergen Belsen, which was the camp where Anne Frank died, and a young German my age really urged me to visit there--he considered it a duty to understand what happened in that era. Mostly one comes away with the sense of a culture that knows it has a past to live down. Although another very strange young German man reacted with surprise and revulsion at a passing mention of Judaism. There are still elements who believe in that old nonsense.
Not quite the tale the OP asked for, but after reading the requests for information from other commenters (and the scarcity of on point responses) this is the best I could do.