My MIL is always invited to ours for Christmas, and a few years ago after a good long snooze after her lunch she said to me "it's so lovely to be cooked for after all those years of cooking, I'm so glad I don't have to do any of that any more!" well that made me fell appreciated, and I was also surprised, as up until then I had thought that she was one of those rare birds who actually enjoyed the process, so maybe a similar comment along those lines will let everyone know how you feel, I think my DS & DD now realise that although I am quite willing to do it for the most part, I do also really love it when they take over and do it for me, my DD invites us all to hers, or my DS comes to mine and does the cooking occasionally as his house isn't really big enough for all of us (and he is a very good cook!), When I first made it clear that I felt that it was unfair that I always did it, they seemed a bit put out, and I got the "but we thought you loved doing it" cry of despair, but once they got their heads around the idea of doing it occasionally it has all worked out very nicely!