Oh, I wouldn't worry about losing your daycare or the family! Take a deap breath and remember that we are all human and we all lose our cool now and then. Also, sometimes we have to be stern with the kids to get a point across. Of course, I was not there and did not hear just how angry your voice sounded, but I would be willing to bet that the parent who heard you has used an angry voice at times as well. I, like Playfelt, also keep my doors locked and the parents ring and I let them in. I have had parents come in to hear me speaking sternly (though not angrily) to their child and I figure, if they leave because of this...good riddance! If the child is misbehaving, a stern voice is needed. Again, a lot depends on exactly how your voice sounded to the other parents (ie. stern vs angry), but I would let it go and just remind yourself to be careful with your voice in future.