I'll tell you how to terminate.
"dear parents, due to your sons aggressive behaviour and for the safety and security of all children enrolled in my daycare I am no longer able to care for him"
the end.
He would have been gone long ago from my home if I had a child like this.
I've only been hit by one child. It was his first day and it was very out of character. I almost didn't let him come back for day 2. And I let the parents know, if the behaviour continues not only will he be immediately terminated, you will come get him immediately.
You have a responsibility to all children, and to be quite blunt.... you are being irresponsible by allowing a child showing that much aggression towards the other kids to stay.
The minute he flipped that buggy mom would have been called. The minute he aggressively pushed that chair, mom would have been called.
Think of the discussion that you will be having with the parent of that baby when you explain to her that a child who has been aggressive multiple times really hurt their baby.
You have to put the safety of all children above your feelings about your neighbour and say good bye! Before someone really does get hurt.