A pattern has emerged with my in-laws.
"MIL/ FiL would you like to come to our house/ go out for dinner for Christmas Day/ Easter Sunday/ your birthday?" We always ask early e.g. in Sept for this Christmas.
Their response is always "Oh, we don't know what we are doing yet. We will wait to see if XXXX (their DD) invites us, our wants to do something with us. We will let you know". So, if DD offers, they go there, if they don't they either go away, or spend it with us.
FYI I know not of any issue, or anything we have done wrong, except that they massively favour their DD over my DH. DH pretends not to notice, but I do and it enrages me.
So, they are spending a few days with their DD, and then have said they will come to us on Boxing Day. SIL and boyfriend are going to his family on Boxing Day, otherwise we'd get the 27th/ 28th.
Well, what if Boxing Day is not convenient with ME? My traditions are that we go out and do an activity and then out for dinner on Christmas Eve, then home in time for snuggles on the sofa and a movie and choccies, and get ready for Santa (OK it's evolved as my DC are a bit older). Christmas Day is the mother of all roasts, a walk, eat your body weight in choccies, and play games. Boxing Day is chill out on the sofa, watch movies, and chuck all the leftovers on the dining room table to graze on all day with a few extras on top. Since I've done most of the woman work, Boxing Day is chill for me. A bottle of wine, movies and grazing our buffet in my onesie. My in-laws are invited to all the above.
This Christmas we will have extra people (they don't know this) and so it is going to be a lot of work. DH has told them they can come on Boxing Day, but I have said I am not hosting and doing Christmas Day all over again.
AIBU to say that if you are constantly asked to join us on Christmas Day, and decline for a better offer, then you can't expect us to host you at that level on another day or Boxing Day?