M.N.
No! It's great for siblings to share a room. I would have set a timer and let them play for a few minutes. When the timer dings that's it...it's bedtime or take away a privelage for the next day. This worked great for a family I babysat while the parents were on vacation. The boys laughed, talked and sometimes even wrestled. Some nights the older boys said he was tired and they went to sleep before the timer even was over. Good luck!