I agree with Melody

And I would definately try not to say to much about the anger.
I would guess that he already knows this and is not happy
he is doing it. But he is so frustrated he just doesn't know
how to stop it.

I would suggest for one thing. That you help the kids with this
issue by getting them some family therapy, even if its not with
him involved. So they can learn how to deal with it.

Donna