I was going to leave, but there have been some v understanding replies in amongst all this - thank you.
In venting I didn't give the full backstory, but the key bit was "So they can show them off despite the fact that they have never been there for any of them for any significant part of their lives". I don't really care about the menu - DCs are hardly going to starve. It's just one more example in a long history of them being completely unable to deal with anything that isn't nice and rosy and middle class and pleasant and doesn't involve any emotion or actual commitment to anything important.
mrsmuddlepies - twofalls is correct. If it makes a difference, we have been married 6 months, together a year before that. My DS2 was 7months when my DH died, DS1 was 7. DSD was also 7 when her mother died. I wouldn't have got by without the amazing support of my mother, and my late DH's parents and step-parents (yes, I have 3 MILs, and two of them are fab). I'm very lucky.
DH desperately needed support when his DW was dying, and despite them living 5 mins away (where they moved to from abroad to "help" once the cancer was terminal) they did nothing, and appeared to be a bit put out whenever a cancer-related incident interrupted their plans for the week. After a late night ambulance for internal bleeding DH asked if they would come over if it happened again so that he didn't have to wake DD and take her to the hospital. The response? "Hmm, well I suppose if it's a real emergency"
That's just one example.
The Spiderman lunch box is making me laugh now - I have no idea if they like Spiderman or not. But they are so much about appearances. This party has been planned in so much detail for almost a year - we've heard all about the guests, the flowers, the venue, the wine, the hotels the guests are staying in, the display of the wedding photos, the music etc etc. They have plenty of time and plenty of money. How hard would it have been to think of providing some sarnies for their DGC? DSD has always been a picky eater. Fair enough that they might not have known that about my DS, but they did about her.
They are not horrible people, and I don't hate them at all. Babarity said it well - the emotional fuckwittery grinds you down. And so I ranted about smoked salmon blinis and Spiderman lunch boxes in a moment of exasperation.