No, inlaws, you cannot come to stay and bring DP's brother too. This is a small two bedroom house. It has one single guest bed, in the study. Which I need access to even while you're here, and thus the fact that you bring everything and the kitchen sink, plus a spare kitchen sink just in case, for a one night stay is not helpful. There is no room for three of you unless you wish for two of you to sleep on the floor of the living room, which I know you don't. Go to a B&B, you can afford it and it will massively reduce the chances of me strangling anyone. DP's brother can stay here, as there is only one of him and thus the guest bed is proper accomodation. Also he's actually good company.
When you descend on aforementioned small two bedroom house with five people, don't suddenly 'suggest' that I will make everyone lunch. I don't mind, but if I'm making lunch for 7 people instead of just me and DP, I'd like more than 10 minutes notice so I can make sure there's somewhere for everyone to sit, and enough food in the fridge.
If I look a bit taken aback at said 'suggestion', and you offer to help, that does not mean one of you helps while the other 4 sit on their arses. Oh, sorry, two of you helped. Except all the second did was destroy my favourite pan. Yes, I had to replace it. No, it wasn't salvageable. No, I'm not happy.
Don't move the furniture without asking if it's alright. I don't go round to your house and move the furniture. Hell, I don't even go round to your house and move a coaster to put my drink on, because you'll have a strop.
If you must move the furniture, don't comment on how long it's been since I hoovered under the sofa. If you hadn't moved the damned sofa you'd never have known, would you?
Do not criticise my housekeeping on three points before you've even taken your coat off. In fact, do not criticise my housekeeping full stop, it's really rude.
Do not then put the kettle on, still wearing your coat, while I'm trying to get a grip on my temper so I don't tell you what I really think of your criticism. Go take the coat off and I might offer you a cup of tea, if you'll give me a chance to actually act like a hostess.
Oh this is cathartic!