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我是公民，2013给父母申请到绿卡，刚注意到今年要到期。 我上网查查，这是conditional green card 吗？网站只提到婚姻绿卡， 没提公民父母？
-It was the mistake on your parents' green card which should have validity for 10 years, not 2 years. They should have filed I-90 to get the replacement with the validity of 10 years when they get the green card. You need to check their green card to see whether there is a correct category code on their green card. If the green card category code is IR0 or IR5, then it is correct. Otherwise, it is wrong.

我要发什么表更新绿卡？
-File I-90.

有费用吗？
-Should have no fee because this was mistake made by USCIS. Explain the mistake in the cover letter, i.e. explain that you were the sponsor to sponsor your father and mother, and their green card category is IR0 (or IR5) which should have the validity of 10 years. You may call USCIS fist to see what they respond.

 多谢