Help Needed Please with...

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Help needed with Emigration laws please.
I'm trying to find out if 4 children, all under 5 years old and the youngest about 6 months old, Could travel from the USA to the UK in 1963 all on the passport, that has no adult on it?

The passport is a USA passport although the oldest child 4 years and 3 months old was born in England the other 3 born in USA.

Also im also looking for a way of finding out the date the passport was used for the flight from the USA to the UK?

If anybody could help me with this it would be great.

Moderator Comment: To acquaint yourself with earlier inquiries please see

http://www.rootschat.com/forum/index.php/topic,373200.msg2471788.html#msg2471788
http://www.rootschat.com/forum/index.php/topic,372827.msg2471677.html#msg2471677