We are meant to be going to stay at my sister's on Christmas Eve, then to DH's family nearby on Christmas Day and back to my sister's for Boxing Day. DH now says that he wants to drive up on Christmas Day, go straight to his family then over to my sister's for the evening. He says there'll be less traffic, and it would be nice to be at home on Christmas Eve.
I know my sister has planned dinner that evening, and she'll be disappointed, but I'd quite like to be at home on C Eve too. Would it be unreasonable to change our plans now? For those of you 'hosting' Christmas, would you be really annoyed if your family changed plans like this?