Thank you very much to those who have given their support, I am really grateful.
It has been an eye-opener to learn that some never want time away from DC - ever, and that some would like a break occasionally like me but have had even fewer nights off.
This weekend is not to salvage my marriage at all, it is just a chance to cement it that it would be nice to make the most of.
I am not asking for regular time off ffs, just a third time in 14 years. Surely that doesn't count as presumptive.
In my particular case, DGP are in fine health, have a big house, a huge garden of around half an acre and a second-hand TV in DC bedrooms there with a stack of vids from the charity shop. Added to that each other to play with and DC amuse themselves virtually the whole time we visit.
I think the issue is MIL is an over-organiser and gets easily stressed, just by having to be somewhere on time for example. She will want to arrive an hour or two early. I'm beginning to wonder if DH is the same and maybe that's why he avoids organising things, it generates too much anxiety.
There is an assumption in ILs family there are no divorces, as laid down by intimidating GGM. I speculate that if GPs knew how valuable time off would be for us they would be more willing.
Just in case I detect an undercurrent of You've Got Too Many Children bashing, I would like to point out I do not have any aunties, uncles or cousins (both DM & DF only children) and my children do not have any cousins either. MIL is an only too - so 3 GPs are only's. To date my family does not bear much responsibility for any overpopulation.