New to this but thought I might get some ideas.

Within the next few months I will be moving in with my fiance. I have a 10 mo old son from a previous relationship and he has a four yr old daughter. My concern is, well I have many but mostly the fact that he does not have set rules for his daughter and allows the kid to run around crazy.. (like not picking up messes and letting her go to bed at any hour of the night.) Ahh which in return makes me crazy. I love this child dearly! She is truly a sweetheart but how do I get the point across that when we all live together there will be rules?