As a green card holder, your mother may sponsor her only if your sister is not married. When your mother eventually becomes a US citizen, she can sponsor your sister (whether she is married or not) But visas in both categories usually take several years to become current, and the fact that your sister is from Philippines is an added reason to believe that approval of her petition will take much longer to become current because visas for Filipinos are historically longer relative to citizens of other countries. There may be other options for your sister to come to the US in a much shorter period. But you will need to consult with an experienced immigration lawyer to explore those more viable options
Answered on Oct 07th, 2013 at 4:14 AM