父母在美等待绿卡期间,因没有社安号,需要把他们列为dependents以报税,请问该如何处理?谢谢指教!
If they have filed I-485, they can apply for EAD and then, use the EAD to apply for the SSN. Or they may apply for ITIN from IRS. See this link for ITIN:
http://www.irs.gov/Individuals/Individual-Taxpayer-Identification-Number-(ITIN)