How do bring my sister to the US, quicker than 12 years?

Unfortunately US immigration law does not allow immediate relatives of US citizens to bring in dependent family members. I note that once your parents are here, they can petition for your sister (assuming that she is single) and the waiting time is  currently approximately 5-6 years if she is born in any other country than Mexico and the Philippines. 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.