-Up to them. It is OK for them to stay legally even if they do not apply for the H4.
付申請人的485pending算是一種身份嗎?
-It is not a non-immigration status. It is adjustment of status (AOS) and that means you or your spouse/kid whose I-485 is pending is in a transition from non-immigration status to immigration status and you are lawful present in US during this period of time even if you do not have a non-immigration status.