QUOTE(zyggy @ Sep 13 2006, 01:47 PM)

Ummm no...
If your sister was born after 12/24/52, in order to work through a grandparent.. both parents must have gotten their US Citizenship through derivation. If that is so, then the residency requirement is waived and only one parent had to live in the US for any period of time. But even then, that residency must have occured prior to her birth. Since I am assuming that your father is not a US Citizen, it is not possible that your sister has US Citizenship.
If you are trying to refer to the proviso un Section 322 of the INA.. please note that that portion is for those who citizen parent died prior to their 18th birthday, since I am assuming that your mother is still alive, that does not count..
Sorry... there is no way that your sister has US Citizenship...
2) As a US CItizen, your mother must file US Income taxes... since the IRS can only go back 3 years, she would have to file for only the last 3 years.
3) If your mother will be sponsoring your sister, she must enter the US to set up domicile prior to your sister entering the US .. she cannot be a sponsor if she will not be domiciled in the US, and if she is sponsoring your sister, it is her who must be the primary sponsor, not you.
Thank you for your response. I don't understand because when I went for my Green Card interview (I had applied through my husband), the Officer left the room for 20 mins and then came back in the room and asked me questions about my mother and Grandfather. He asked me if I was a Canadian citizen, I told him yes. He told me had I not taken out Canadian citizenship, I would have automatically become a US citizen, and he said I could have avoided the hassle and money. See I lived here for 6 months at the age of 6, I left, and moved to Canada, so they saw that as abandoning my status and taking out another country's citizenship (because I was not born in Canada). That was the only thing that stopped me, not the fact that my mother never lived here, he based it on my grandfather living here. He knew that my mother had only lived in the US for 6 months but I told him my grandfather lived here practically his whole life and was in the Navy. He said the only thing that stopped me from getting US citizenship was the fact that I took out another country's citizenship after abandoning my US status.