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想申请入籍，只需要填写400表格寄出去吗？-Yes and provide the copy of your green card (both sides). You may file it online and it is very convenient. See:
https://www.uscis.gov/file-online

我的儿子21岁了，他要单独申请还是可以我申请他？ -He needs to do it by himself individually.