ledkr that sounds good to me, you are definitely not being unreasonable. If anything, you're being too reasonable. The thing that annoys me the most about it is that it's so presumptuous, just expecting to stay like that. At least wangle for an invite first!
DH just got back from Sainsburys with instructions to look into breast and maternity pads for me but he didn't buy them because he said they might be on offer between now and D Day and then we can really stock up. Meanwhile, I've been mning, marking and keeping an eye on the snow because it's now snowing in deepest darkest Kent!!! No school tomorrow, hopefully! 
Apologies to those of you who don't want snow, but for me it means no work while still getting paid. Although for DH it means no work and no pay so it's not all good news.