I am sorry for you and the girls loss. I agree though I would not be bringing it up with the other parents unfortunately when you have children on your property it is your responsibility to supervise them. 9 year old girls can be very skitish. Would probably only needed one other to say hey come look at this and they would have forgotten totally about the poor piggy. Sometimes we learn this lessons the hard way. (I know have learn't some myself this way).