I'm a Japanese citizen and married to a Canadian and have 2 children. They are both born in Japan. They hold dual citizenship right now. They don't have Canadian passports. They only have Japanese passports and they're using them to travel to the U.S. Only ID they have for Canada is "Certificate of Canadian Citizenship" what they call birth certificate cards.
1. Is "Certificate of Canadian Citizenship" card a national identity card FOR TRAVEL? Is that considered as a travel document?
2. If so, what should I put for the Expiration Year? Those cards don't expire.
3. Since they are both born in Japan, for the question "How did you acquire citizenship / nationality from this country?", which should I choose "By birth" or "Through parents"?
4. For the question "Have you ever been a citizen or national of any other country?" Is "No" correct? (Or Yes, they have been citizens of Canada?)
I e-mailed CBP INFO Center and asked the same questions to make sure but I didn't get sufficient reply. Please help me.