How do you react if your inlaws always visit you unannounced?

Weekend is spent in household chores and laundry. After a tiresome day, you want to doze off and take a nap. Suddenly you heard the doorbell. dingdong the inlaws are again here. I mean the mother in law and sister in law. Their presence is a really uncomfortable one. Its so tiring to pretend nice to them. they are only spot checking something untidy and wrong in the home. They say they want to see the kids.How to deal with them?