Short history, we have a holiday house on the south coast. I made the mistake of inviting our ILs there for a week of our annual fortnight there when we were first married.
They are quite difficult people and over the course of our marriage I have really come to loathe FIL. He has drink problems and behaves unpleasantly on a regular basis. He and MIL show blatant preference for my DSD (their 'real' GD) with 'special' cards and gifts, and can be quite impatient and nasty with my DD. Our youngest DS (my DH's son) is still small and FIL is determined that he will play with him even if it means grabbing him and refusing to put him down when he cries to be let down. I consider him a danger around DS as he has nearly dropped him at least twice when he's been drinking and has been known to grab him and wander off with him when I'm not looking even though DS has been crying for me. He is a self centred, dislikeable man and they are both stressful people to spend a holiday with, after two or three years of having them with us I said no more - I was starting to dread our holidays rather than looking forward to them.
Three years ago we told them we just wanted the time to ourselves that year. Two years ago they asked if they could come (very thick skinned) and were told again we just wanted a holiday on our own. Last year, having bought a FUCKING BOAT! they said they would drop in on us whilst cruising along the coast. I just don't want them on our holiday at all any more so again they were told we wanted the holiday to ourselves. You would think they would have got the message. We go again next week. Today I saw FIL - he said, as he was leaving, in a quite challenging way;
"I may or may not see you in X town. I am determined to get there on my boat".
I KNOW what he means by this is that he knows I do not want them on our holiday but he does not care and is going to try to come anyway. I smiled and said, Well maybe see you there. The problem is if DH tells them AGAIN not to come it will cause a massive family bust up I think, DH's siblings will side with their parents and it will cause grief. But I am so, so angry that they are just going to inflict themselves on us like this. I don't know what to do though. Please believe me, they will ruin the holiday in so many different ways, he is awful.