Fight! Fight! Fight!

The family dynamics are not exactly clear to me - but I'm fairly certain the one being dominated is a young male. He doesn't puff up to make himself look big like the others do - instead he sort of flaps his wings and peeps like he is still a baby.
That all would make the other one either also also a young male, or an older one that feels his position is in jeopardy.
Either way, there has been a LOT of in-air strikes that I have been unable to catch - but I got lucky with a ground battle.