Originally Posted by
shorthauldad
Wouldn't a "family passport" show date(s) of birth?
Yes.
It's not uncommon for American people with international family ties to try to squeeze in one last lap-child ticket trip for their U2 child because it commonly means a substantial financial savings over the ticket cost involved as soon as the child turns 2 years of age.
If U12 children discounts were as prevalent to/from the US as they used to be, the OP would be spared the frequency of some of these sights.