I am taking two kids to Europe this fall. I called the international desk and got the fares.
Child fares... 12 and under.. or maybe 11 and under are 75% of adult fares. That's what I got anyway.
Maybe otheres are different.
There was mention of companion fares that are even cheaper on another thread here, but when I asked AA about it, they said no.
Who knows?
I hope that helps.

------------------
TANSTASFL - but if you work it right, FF miles comes pretty close.