If you just want them to stop acting like guests and start acting like roommates, start assigning chores and handing over the grocery lists once in a while.... "Hey, Susan, while I'm at work today, would you please vaccuum and water the plants?" or (In a joking tone) "Isn't it your turn to do the dishes?"  Open bills in front of them, and complain aloud about how high they've gotten.\nIf you want your house back, then be kind but blunt... Sit down with them and say "I have loved having you here, but I'm afraid that I can't have you stay much longer...I have XXXXX happening in a couple of weeks and need to have some time to myself before that, but it's sure been fun!"\nOr lie and tell them your landlord has reminded you of the terms of your lease and your rent will be raised if they stay more than another week.\nGood luck!
How do you get people to leave when they have over stayed their welcome?