We took in a stray 2 month old male kitten one month ago. We just brought in another female kitten, who is actually this ones sibling. They were raised together until we took him one month ago. They spent their first 6 hours together running around the house attacking each other. We couldn't tell if they were playing or fighting, although it looked like fighting to us. One got a small cut on the face. These are our first cats. Is this normal? Will they calm down? Is it possible they will never get along, and what should we do to get them to get along with each other. Any information will be appreciated. We have them sleeping in separate rooms because we are afraid they won't get any sleep, when should we allow them to sleep in the same place. Any information will be appreciated. Is is possible we made a mistake by taking in the second cat? We thought it would be better if our cat had another to keep him company, but were we wrong?