Mice Siblings and Brother

Our mice siblings are a bit put out with the human tonight.  She gave Brother a mouse toy this afternoon, and they aren't happy with how he has been treating, batting it, and swatting at it, and popping it on it's little mouse head, and pulling on its tail.  They're sure the toy will give him horrible ideas, and after that, it is only one step from the toy to one of them.  Do you suppose they do have a right to be worried?