3 DC under 4? Of course you stay at home!
"Basically, our Christmas Day since we have had children has to be split into 4 so everyone can see the kids. We've tried having a day on our own and we were called selfish."
"Had to". No, it didn't have to, it really didn't. This was you and your husband being too nice for your own good, although I can understand that you and he have been manipulated by the four of them since your teens and part of that manipulation has been them training you to put them first.
It's clear from your posts that all four of your parents need to grow the fuck up, and from now on I'd be treating them like toddlers (you have experience
) and be placing them firmly on the naughty step.
So, in my opinion, I would make it clear to all that Christmas is for the children not the adults, and it will be conducted in their own home with their parents and no grandparents. All their moans "about how I'm spoiling it for them" are to be returned with interest about how they have continually spoiled it for YOU and DH, with their moaning and their crying.
I'd be inclined to inform them of your decision by text - the same one to all four. And as I said, treat them like the toddlers they're behaving - all moans and complaints to be ignored, dealt with firmly and CONSISTENTLY by just holding the line that the decision has been made and is not going to change so put a sock in it. If they phone, do not hesitate to inform them that you will hang up if they cry/are abusive, and do so.
I realise this will not be easy for you - they started their manipulation when you were both teenagers, and it's not easy to shake off. Would it help if you dealt with each other's parents rather than your own? Yes I'm sure they'll strongly object ('Put them on, I want to talk to my son/daughter not you!') and feel hard done by, but maybe you're each less susceptible to being manipulated by your ILs as opposed to your parents? You may no be, they might be able to push both your buttons, just thinking aloud for anything that will make it easier for you.
Please, be assured, you are not wrong to want this, you are not selfish, and all four of your parents are total knobs for pushing you around like this. My sympathies.