Charlotte,
I feel sorry for you...in-laws suck...especially if they have dogs! We had to live with my in-laws about 6 years ago for 2 months while we were waiting for our house. It was not so bad since they vacation a lot in the summer. They were there part of the time though. It sucked. I feel for ya!!!! Can't he just buy your house? Hey, make him clean!!! Scrub toilets, clean ceiling fans, mop on his hands and knees, etc. Surely that will make him hurry and find a house!
Sara