8老师好! 朋友在美，妻子儿子都在加拿大，去年他们以H4来美提交了AOS 485，然后返回加拿大。现在需要过来做体检，但是儿子已经过了21，网上写H4只能给spouse or child under the age of 21，这是否意味着他儿子不能拿到H4了？
-You are right. He cannot get H-4 visa to enter US based on the immigration law because he is > 21.
请问他们来美一定要H4签证吗？能否用B1？谢谢
-Probably he will ahve trouble to enter US using B1 or B2 visa because he has immigrant intent (I-485 filing). Also, even if the IO allows him enter US using B1 or B2 visa, his I-485 will be void. He should have applied advance parole before he left US.
