Could be long sorry.
I have been married to DH for 15 years and have always had problems with MIL and SIL. SIL has a mild disability which means an operation every 5ish years and day to day issues but she is mentally 100% and works, lives on her own etc. MIL has dedicated her whole life to SIL and woe betide anyone who has a bad word to say about her.
Anyway, MIL sees herself as the head of the household and was very put out when I came along, as was SIL. She dictated where we needed to be every weekend even though we lived in London and they lived an hour away - she would tell us we had accepted invitations to events and were expected there so we couldn't say no - that kind of thing. SIL has always been openly hostile - she used to slam doors in my face but apparently she had behaved like this towards all of DHs gfs so I tried REALLY hard to be friendly and it got a little better. On the rare occasions that we (or other friends or family) have quietly mentioned one of these outbursts MIL has gone MAD and come out fighting - really not nice. Again, there is NO mental disability - she is just used to behaving like this and getting away with it as everyone is too afraid to say anything.
Against my better judgement I agreed to go on holiday with MIL, FIL (who is lovely) and SIL and ours dcs a couple of years ago. Nightmare. SIL was openly rude and abusive, and on one occasion when I mentioned that I had 2 friends who had similar issues to SIL's MIL went MAD that I had dared to "diminish her problems" by saying it was common(!) and went and woke my sons up crying over them and wailing that I would never understand disability.
I have tried REALLY REALLY hard to understand and in 15 years have plastered a smile on my face and NEVER bitten back because I have tried to give them the benefit of the doubt..I DON'T have a disability so maybe I don't know.
Anyway, the problem. This summer FIL is 60 and SIL is 40 and MIL has announced that we're all going away together (with DCs) to stay in a house for a week. I don't know why but after 15 years I've just had enough, I can't do it. It will be another week of being criticised/ignored/whispered about and I just can't bear the thought. I am angry with myself because I feel like I've made a rod for my own back by putting up with this for so long and allowing them to behave like this, but ALL the extended family feel the same (there are endless conversations about how to bring this up) and if anything is said to MIL she will literally cut us off - she threatened to once before.
That might be a blessing except...FIL is lovely. Dh adores him, I adore him and DCs adore him. He would LOVE to spend a week all together and he's not getting any younger... He has always largely ignored MILs behaviour but has said openly recently that he plays golf 5 days a week because he doesn't want to be at home. He also realises that SIL is very difficult but says he tolerates it because he brought her into the world.....
My heart and mind are fighting it out. I want to make FIL happy - he deserves it. SIL will have no celebration for her bday otherwise - she has had friends over the years but has treated them all the way she treats me and at some point and they've moved on. I have suggested that just DH and the kids go but understandably he doesn't want to use a weeks precious holiday apart (he gets very little)
How can I make this work? Or is it just a recipe for disaster?
Thanks for reading.