I think it is human nature to lose your cool once in awhile. I'd be willing to bet anyone who has ever worked with children has raised their voice with a child at some point, and if they say they haven't I wouldn't beleive em'
We have all done it, I am sure. Rarely, but it does happen.
I would tell Mom what her child did, that this occurred after having to speak with him numerous times about his behavior and that you did raise your voice at her child.
If she gets mad, well then, that gives you a good idea of why his behavior is the way it is.
