Yes, which i dont think you can if they are minors, and you might not want to even if they are not given the risk of being seated separately. Most AA coach cabins have a 3 across section somewhere.

That said recently with our family of 4 i split our record up to get J upgrades LHR- JFK, 2 with SWUs and 2 with mileage upgrades. No waitlisting as all was available at the time, which made it easier. And we had an adult for each kid if we wound up in different cabins.