DH and I find my PIL (his DP) extremely challenging.
They are completely deaf to any social cues and this makes them very real bullies. They do only what they want all of the time, and they refuse to treat other people as if they might ever have different thoughts/feelings/desires. This is generally not over very large things, but rather a stream of small things that, added together, make their company overwhelming and rather soul-destroying.
To give an example: they have just been staying with us. MIL needed the loo both nights at 5am. However, instead of just doing this quietly, she stood outside our bedroom door and talked at normal volume (which for her is very loud) to the cat who sleeps in the next room, waking both of us up. We were going to an events which necessitated a 7am start - we drove them there (an hour and a half), were out all day with them, and then drove them back at 8pm and then turned around and cooked them a three-course meal. We were quite literally unable to stay awake, so went to bed at 11.30. FIL refused to go to bed until 2am, which is not in itself a problem. What was more challenging was that he insisted on waking us up to ask us whether the house was secure before turning in.
This is just one trivial example - but similar things happen dozens of times every day. If you voice an opinion or desire that doesn't chime with theirs, it's completely ignored. They are passive-aggressive in the extreme and will guilt-trip as often as they can. They are, quite simply, exhausting. I is like being bulldozed physically and psychologically. It doesn't help that we always do whatever they want to do, even though these are the kinds of things we'd never do alone.
We see them for a long weekend 3-4 times a year. They live a long way away and are pushing to see us for holidays more often, and I just can't cope. I find two to three days of their company is my absolute limit. DH is in agreement. However because they don't understand or respond to social cues, they just keep asking us for more time, even though we stone-wall for England on every suggestion. Should we say something point-blank, which will cause huge umbrage and offence, or just keep on keeping on as we are?
Also, if anyone has any suggestions of how to manage the behaviour, I would be really grateful.