My great-grandmother from my mother's side was born in the US and moved in Canada a couple years later. I know that she had her American Citizenship, but when she gave birth to my grandfather, she did not gave him the American Citizenship. But my grandfather knew she was American and he asked for a green card, but he didn't asked for the citizenship. He lived in the USA about 6 months a year during 20 to 30 years and he still alive.
On my father's side, my grandfather was born Canadian, but worked in the US and got naturalized after my father's birth. My father never lived or worked in the USA and he is obviously not a citizen.
I would really like if you could tell me if there is any chance for me to get an American citizenship or a green card.
Thank you very much.