In fact, a very realistic point has been chosen by the author for the discussion. When there is more than one child in the household, it is very natural to have quarrels. We may expect the elder children to adjust and try to ask him/them to keep calm before their younger but after all, they are also children, so it becomes very difficult to make them understand. As far as pillow fight is concerned it is also quite common but not in the fight only sometimes, children play with a pillow just for fun. I agree that pillows are used for good sleep but sometimes people do not be too conscious while enjoying something.