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一个朋友为妻子办理移民签证。来求我为他的妻子当经济担保人。请问，我有什么责任？
他告诉我说，只有他妻子需要申请美国政府资助的时候，才会来找到我。请问，有年限吗？我要负责他们一辈子吗？
--When you sign the affidavit of support, you accept legal responsibility for financially supporting the sponsored immigrant(s) generally until they become U.S. citizens or can be credited with 40 quarters of work. Your obligation also ends if you or the individual sponsored dies or if the individual sponsored ceases to be a permanent resident and departs the United States.

If the individual you sponsored receives any "means-tested public benefits," you are responsible for repaying the cost of those benefits to the agency that provided them. If you do not repay the debt, the agency can sue you in court to get the money owed. Any joint sponsors or household members whose income is used to meet the minimum income requirements are also legally responsible for financially supporting the sponsored immigrant.
See this link:
http://www.immihelp.com/affidavit-of-support/sponsor-responsibilities-obligations.html


 谢谢。