Giggle or snicker?

I don't know guys. About this one. Pre School teacher is cautioning his Mom that this one has a bit of covert malice in his nature.

He is an only child.

Now, the other nephew's boys? They beat on each other something horrible. Talk about your hostile tendencies. When they get to school they are loud and physical. Nothing covert about them.

But this one? He is quiet and sly about it. Hmmmm.

This is all here say. I have not witnessed it myself.