I don't want to accept it! They have a habit of doing things and then saying "we did this for you so you should do x,y and z for us" and just using it against us in the future.
Many a time mumsnetters have called my mil a narc and her husband her enabler etc and I'm concerned the "gift" of a weeks holiday (without them) will eventually come back to bite us in the ass.
Here's the thing I don't know how to say "thanks but no thanks" with out seeming ungrateful. I'm yet again worrying about another fall out if we don't accept the offer with lots of thank you's, meals out, cards and shit as to not seem ungrateful.
Maybe it is just a nice offer but I don't feel comfortable about it, especially the money side of things.