I feel I shouldn't be participating in this, Méabh, but what the hell...
A girl and her boyfriend find out she's pregnant with identical twins. As they are too young, they decide to give them up for adoption. One of them gets adopted by a mexican family, who names him Juan; the other by an arab family who names him Amal.
Years pass, and the girl gets nostalgic. She asks her now husband to help her find her children, so she can see how they are doing. So they track down the mexican family, and they have a very nice reunion.
The girl then says that she wants to go look for her other son, to which her husband replies:
"What's the point? If you've seen Juan you've seen Amal"
And just a clarification for you gringos, although it kind of screws up the pun.
Juan shouldn't sound like 'one'. People in the US say it like 'gwan'.
It should really be pronounced like 'who' + 'Ann' only in one syllable, like 'hwan'