如果等主申請人的I-485 approval後，小孩過了21歲，還能file I-824？現在小孩還不到21，這樣一起提交是否更好？問題太多，太謝謝了！
-The information you provided is very confusing. A couple of days ago, you post this "8老師好! 朋友在美，妻子兒子都在加拿大，去年他們以H4來美提交了AOS 485，然後返回加拿大。現在需要過來做體檢，但是兒子已經過了21，網上寫H4隻能給spouse or child under the age of 21，這是否意味著他兒子不能拿到H4了？" Now you say: "現在小孩還不到21".
If the child is still less than 21, I suggest that the child ahd better enter US using H4 visa to enter US and then, do the figerpringting (if the child filed I-485 already) or file the I-485 (if teh child does not file I-485 yet).
If the child is > 21, the parent had better file I-824 now ( as soon as possible) for the child using the Child Status Protection Act benefits. Otherwise, his child will be age-out and thus, the child will not be qualifed for immigration as his derivative. The child and spouse do not need to have H4 status because they are not present in US.
Your friend had better consult an immigration lawyer in case there is trouble in the child's immigration because the information you provided is not complete and confusing.
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