So Beast brought back the original X Men just to stick it to Cyclops. He risked the timeline and pretty much the fate of the world so he could just get a rise out of Cyclops.
Also lets not forget that he originally left the X Men because he was morally opposed to X Force, yet he joins Wolverine's school knowing full well that Wolverine was continuing assassination missions with X Force, just to spite Cyclops.
What do you think? Have any other examples of him being a child?