I have one family whose kids like to scream. The oldest one used to do it when she started coming to my daycare and now that I have her little sister as well I noticed she also does it. My guess is that it is allowed at home. It drives me nuts and hurts my ears! I just do constant reminders when it happens. No we do not scream in the house, inside voices please! - in my stern voice. Eventually they will catch on until then have the wine and Tylenol handy for your evenings!