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在kid’s I-485 in the “Applicant’s Signature “ part format: XXX/(kid’s name)/ by mother: XXX( my name), kids name and my name 是signature 还是print name 呢？另外，我儿子可以自己写他的名字，可以他自己签名就行了吗?

-No. Signature means signing the name by hand, not "Print" it as Capital format. You need to sign it for him because he is less than 14 years old. He cannot make the decision by himself at this young age.