> North Korean and South Korean are completely different dialects, with different orthography and spelling. Bigger differences than different spellings in English. I can't see a dictionary like that being of any use to his family.

I'm actually studying Korean right now, and one of the textbooks I'm using relies on the North Korean dialect. I can attest that the differences are minor, and are mostly limited to things comparable to 'color' in AE and 'colour' BE.