We three girls went to the south to be teachers, living in three rooms and one living room, one big room and two small rooms. I don't know how to divide the big room now, but I'm afraid.

Just pay a little more for the big room, not too much, or invite the big room to have a meal and take on more housework, and the three of them can discuss it themselves. If there is really no result, I advise you not to live together. There will be more things in the future. In short, we must talk openly, don't be embarrassed, and talk politely now.

I hope I can help you.