Originally posted by tasuki
[B]As far as I know each country has different accords with Japan, so child nationality isn't handled the same way for each nationality. In some cases, I've read, children born in Japan from a foreign parent are not granted Japanese nationality, period.
I understand that evey country has different laws about nationality. I think there are 2 categories of countries : those considering the "right through blood" and "right of land". Most immigration countries like the USA, Canada or Australia have the latter, which means they give citizenship to anybody born in that country. However, in some countries (Italy, China, or Germany till a few years ago) nationality is given by the parents wherever the child is born. In Japan, both systems are used so that one should ideally be born in Japan and be of Japanese descent. That's why Japanese Americans, Brazilians, who were born abroad are not considered Japanese anymore (also because Japan only accepts 1 nationality). That's also why foreigners born in Japan are not Japanese (just ask the 2nd and 3rd generation Koreans and Chinese here) or why the millions of 2nd, 3rd or 4th generation Turkish immigrants in Germany couldn't become German until about 5 years ago when they changed the law.

... then as a permanent resident of Canada, she becomes subject to Canadian abduction laws (Canadian permanent resident abducting a Canadian citizen), thus subject to extradition for prosecution. Whether that actually happens, is another story. I've done my homework...
Permanent residency is different of citizenship. What's more, Japan doesn't extradite its own citizens, as we've seen with Fujimori. Your wife or children couldn't be extradite if they are still Japanese. What's more Canada has no power to come and fetch people in Japan. At best they could arrest the abductor if they come to Canada or ask the Japanese government to hand them over, but they probably have better to do.