DD1 is 3y9m and DD2 is 15m. They've been room sharing for almost a year. Mostly it's going well, with an occasional brutal night with lots of screaming and keeping each other up. But typically they do great. We are thinking of buying a house and likely will end up with a 3 br. Do we separate them? Keep them together and have a guest room for the first time ever? What would you do?