Me, My wife and Daughter has our IV stamped in Chennai, India. Is it ok, If I travel alone to US first(Due to a urgent Requirement), get I551 stamped and come back to Chennai after two to four weeks to take my family to US? Will there be a problem in POE when I am entering with my family where I have I-551 and my family has only IV(to be I551 stamped)? Please advise.