Which dimension does your dad hail from?
IIRC he's from Earth #2145, at least going by the Heisenberg quantum-parallel index.
Pretty close to ours up until 1939 where it split off, Vichy France, aided with the Merovingian ascendency went full on Nazi, and held out in their colonies until 1963, and Mao wound up fighting along Chang Kai Shek, and the nationalists. We broke the codes in time, and met Yamato full-on in the Pacific, instead of being waylaid in Pearl Harbor. But lost Midway, and wound up using Little Boy on the Philippines, and then Fat Man on Tokyo.