My in-laws have keys to my house. However, they often come unannounced and because we live so close to each other, they visit us everyday and whenever they feel like it. They are both retirees. How do you tell them that we need space. My husband does not speak to them. Whenever they visit, he would be in his study. I have tried dropping all kinds of subtle hints and even obvious ones but they are not taking it. I feel like changing the locks to my house. Any other suggestions?

I understand where you coming from. Your in laws came to visit you, what do they usually do when they are in the house? You mentioned that your husband will be in his study, he don't even entertain his parents?maybe you can do the same? Stay in his study together with your husband or in your room doing your things? Maybe your in laws have no one to talk to or see no meaning being at your house and they will go? I reckoned changing locks if not a very good idea, as it is literally 'slamming the door shut at their faces' unless you can come out of a very very good reason. The best way is really to get your husband to communicate with them, cause in anyway they won't be angry or mad with their son forever.