FIANCÈS PARENTS!!

Okay so me & my fiancé have a one bedroom. There's a girl and her little sister who needed a place to stay for a while I used to be friends with one of them back in the day and she just had a baby and had no where to go and gave the baby up so I let her stay with us she was in our bed since i felt bad she just had a baby and didn't want her on the floor it has been her and her sister in our bedroom for over a month. We had only been living there for 2 weeks when we let them have our bed and room so they were in the bedroom longer than us while we slept on a matress in the living room that we just threw out. We'll tonight my fiancés parents announce they are coming through town and kinda just invited themselves to stay the night....that would put us on the floor AGAIN! They have been noting but rude to me called me a dumb bitch and everything and my fiancé is mad cause I don't wanna go back on the floor again! Might I add I just traveled for over a week and have been sleeping in the car for over 40 hours. Am I wrong for not wanting to let his parents have the bed? Shouldn't they just get a hotel?