回複:求助!子女替父母申請的綠卡可否由子女申請取消?

Once her I-485 is approved, the I-864 binding is final. You cannot avoid I-864 obligation (unless for expenses occurs after she left US for good or she becomes US citizen)
But in reality, I haven't seen US government ever ask the sponsors to pay for the public welfare that GC holders use.

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