I have to admit I was chuckling reading this report!

Tommy and Mandy do NOT get along. They can go a few hours, and then he has to taunt her, which results in the screaming you described. Since she already lives in one bedroom, I just shoo him out and close the door so he can't return. The door is closed at night so I don't have to worry. And if I am leaving for any length of time during the day I close it too. Dad wouldn't have a clue what to do with them.