We go to the same place on holiday every year (in UK). The first few years, I got roped in to our PILs coming along for a few days, basically I invited them out of politeness after they dropped heavy hints.
They are difficult people. FIL mainly. He drinks, smokes, is irresponsible with our youngest two (holds them unsafely, shoulder carried dd at 13 months with hands in his pockets, has fags then immediately grabs youngest dd who is weeks old and holds her when he's absolutely stinking). He is bad tempered and unpleasant to my DS of 12 who is not my DH's biological child but shows huge favouritism to my DSD,DS has even been asked to to get out of photos so he can take pics of his 'real' grandchildren, and many other things like this. When he is drunk he grabs the youngest two and staggers around with them and has refused to hand them over to DS when they have been crying for them,as they obviously love their big brother v much.
Anyway last year I'd had enough last year and asked DH to tell them that this year we just wanted a quiet holiday without them. I hoped they'd get the message.
Not so. Today they informed us that they are going on a driving tour of the area we holiday in and are going to pop in whilst we are there (they have ascertained dates with dh and kids, we can't really ask the kids to lie about when we're there) and will 'pop in' to say hello for a day or so. The place where we go is very remote and inaccessible in bad weather. I could just about tolerate them for 1 day if I knew for sure they would go away again, although it bugs me a lot that they don't understand this is our family holiday and not a public event they can just drop in on uninvited. I've had PND and was really looking forward to a quiet time and am now dreading it. But if the weather is bad they could get stranded and we could get stuck with them for literally days.
Please if anyone can think of any decent excuses that will not case offence I would appreciate it, feel so down and anxious now. The holiday is in a few weeks.