Your stepmother can petition for you if she and your father married before you turned 18. However, the processing times will be about 7 years anyway before you can obtain an immigrant visa, given the backlog in priority dates. It would be even longer if your father petitioned for you (8 years). And during this time, you cannot be in the US unless you can do so through another non immigrant visa status. Please let me know if you have any additional questions or how I can be of further assistance to you in this matter.
Answered on Dec 06th, 2012 at 4:09 PM