Will my father’s wife be granted a greencard if I file I-130 for my father?

The immigration laws only allow sponsorship of the stepparent where the marital relationship was established prior to the petitioner (you) turning the age of 18. In this case, you would have to first immigrate your father, and he could then petition for his wife under the F-2A category for spouses and minor children of lawful permanent residents. There is current visa availability for that category and assuming that it remains so in the future, his wife could conceivably enter the US with her own green card within one year after he obtains his. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.