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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)