Unexpected, uninvited visitor

So my father in law has decided he's coming to see my husband and I, and is staying at our house for a week at least, as of tomorrow.

He didn't ask, he told us. I'm really annoyed! He's hard to get along with at the best of times but now he's invading my home...the place I can escape to relax and rest.

Pregnant me has no patience and I'm worried I'm going to snap. He's rude, has poor hygiene and enjoys telling everyone how wrong they are and how right he is. And to top it off he owes us $4000 which is a constant sore point between my husband and I.

Any suggestions for getting through this?