Well we made it a whole 10 miles in from Calais, leaving the toddler twins with my mum (also caring for a poorly husband) to have a long awaited break with 3 DCs, arrived at the campsite and 'SURPRISE', my in-laws had found the details and decide to book accomodation on the site as well.
I smiled and was delighted as a DIL should be, but two months later I am still fuming - as I doubt that we'll ever get a proper relaxing break away with only three children again.