Learning to appreciate things. I think this varies wildly by personality though. Some wouldn’t do as well as others. That being said, I think it would be more relevant to kids who were previously living separately and then forced into the situation. If they always shared a room, they should be used to it. I would think that a parent’s diplomacy skills would also be important to how the arrangement is viewed by the children. Fairness, and compromise are essential to shared quarters.