Anti-Semitism was a rising menace when Tom Singer's parents met and were married in 1930 in Germany. But Elsbeth and Rudolph Singer had deep German roots and stayed during the Nazis' rise to power even as Hitler imposed ever-harsher restrictions on Jews. The Singers considered emigrating when Rudolph lost his livelihood because Hitler banned Jews from practicing law. But a relative talked them into staying. He assured them the political climate would...