Partner and I welcomed our DS earlier in the year. Now, obviously it is nearing Christmas. Due to complications to do with DP's family last year, he ended up spending Christmas alone whilst I spent mine with my family. To avoid this happening again, my family said he was to come to ours for Christmas, then we would visit his family for two weeks straight after and see the new year in with them. DP has gone along with this all year. It also makes sense, as my family are happy to bring us down and take us back from/to where we live, meaning we can actually take DS's presents down so he can have a proper experience, whereas DP's family live 5 hours train journey away, and with everything else bringing DS's presents may be an issue (because good lord are baby toys big!). With my family, they kindly put us up as they know money is short and quite frankly they just want to spend time with us. DS adores them and visa versa. DP's family are not the same, so I was eager to get the hotels booked ready for the trip.
DP then hits the bombshell that he can't do Christmas.
'Any other day but that one.'
Naturally, I told him that myself and DS would be spending Christmas with my family. His family - for background - has not even met DS. I would not want DS in a cheap hotel on his first Christmas surrounded by people he doesn't yet know. I also reminded him how he had agreed to Christmas all year. DP huffed and that was that.
Cut to today, discussing Christmas plans with a friend. DP trying to work out his dates for work around Christmas. DP quickly says (whilst I'm distracted with friend) that he could head to his family on Christmas Eve and Christmas Day, then back up. I quickly call him out on this, and reiterate that he would be missing his sons first Christmas and that his plan is redundant as we would need to travel to his family straight after Christmas, unless he expected me to take a baby (who has never been on the train) on a five hour journey alone with presents, pram, possibly a travel cot etc. He pulls a sad face, but a face that says 'I've made up my mind but if I look sad she'll give in.'
The only thing against me: DP's father has been ill, having had surgery. I understand why DP would want to go for Christmas, but he wasn't even told of his fathers illness until his father had already been in hospital for several weeks. Nobody told him. His father will make a full recovery, and is awaiting discharge, but I know this could potentially be used against me.
AIBU to dig my heels in? I refuse to deal with a crying baby in a foreign environment with strange new people (who he will one day love, I'm sure, but for now who will be strangers) just because of DP. My family adore DP and have taken him in like their own. But if he misses DS's first Christmas I know it will really fracture relationships, especially ours. I'm not very sure what else to do/say. Suggestions?