I have a hard time seeing your dad's wife as the bad guy here.
She wanted to celebrate Thanksgiving with her family (does that include her biological children?) so she hosted Thanksgiving dinner at her house and invited your family.
You chose to host Thanksgiving at your house because you have a baby and invited her and your dad.
Your dad's wife cooked her own feast, hosted the party at 1:30 and then at 4:30 (3 hours after her dinner started so presumably her relatives were still at her house?) drive over to your house, so her husband, you dad, could spend a little Thanksgiving time with his son and grandson.
Assuming that they were polite about it all, that seems like decent flexibility to me. Of COURSE they didn't eat any food. They had just finished their own meal!
They came and saw the baby for about an hour before he had to go to bed -- that's pretty normal for gatherings with a baby. Even if they had come at 2 PM chances are the baby might have been napping or something right?
I think you are totally within your rights to say you don't want to shlep around on holidays to three houses. But unless I am missing something, these don't seem like bad people to me.
As a threshold matter, I really want to thank everyone for contributing to this thread. The holiday scheduling, for me, has been the most emotionally difficult thing for me as an adult. It's the one thing my divorced parents bitch about, and it's hard. I know that, if this is the worst of my problems, that means I have a pretty good life, and I'm okay. But this has been a great and necessary space to vent for me.
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I've wasted an hour typing and deleting a lot in response to this. There's a lot of backstory here, most of which I deleted. And I don't know why I feel compelled to share why I feel the way I feel, but since this has turned into a journal of sorts, a few things:
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My dad's wife has never respected any of our family traditions. It's been her way or the highway for a decade.
I've typed and deleted a lot of examples, but eventually came to the conclusion that it's pretty much everything -- the food, the atmosphere (casual vs. formal), the tree itself, the lights, everything. There is not a single tradition we did as kids that still gets honored over there.
Conversely, my brothers and I have always tried to accommodate her and her daughter. They have a little "traveling" birthday cake; it's this little plastic cake they light up on people's birthdays, and they've done it forever. We always make a big deal out of it with them now. They also hide this little pickle ornament in the tree, and the winner gets a silly gift. We've always played along.
My dad's wife has never really reciprocated. The holidays have been her way or the highway ever since she's been around. And she's always picked the date, leaving my mom and our in-laws scrambling for goofy days to celebrate.
I completely understand that she should and need to see her family on the holidays. But being completely inflexible and wanting to dictate the holidays on her terms, when we expressly said that "the kids are trying to start a new tradition," is par for the course of the last decade-plus.
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On top of this, my dad's wife also refuses to schedule anything unless EVERYONE can be there, her daughter included. We've invited them out to dinner to be with our son probably 5-6 times this year. They've never accepted because "Sibling X can't make it, let's do it another time." And I always insist, no, let's just get together anyway, and it never happens. They live 0.8 miles away and they've stopped to see our son four times.
So again, the scheduling stuff is not an abnormality this year. She scheduled when she wanted to schedule and didn't take anything else into consideration.
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I've left out other probably more important stuff, including how rocky things were when my dad's wife came onto the scene. I can assure you that will nuke the thread, and I'm not here to trash my dad's wife, so I'm going to just keep it to the holiday stuff here.
But based on what I've said, I hope you can see, from my perspective, that her Thanksgiving scheduling was somewhat of a protest at the kids revolting. She's had it her way for more than a decade now because nobody has ever stood up to her.
All of her family is in town. She absolutely could have hosted at noon, or at 5:00, or even on Friday. But no, she couldn't give in, because she's never given into anything.
What I'm ultimately getting at is I'm just completely fed up with having my dad's wife dictate everything. And now that we are hosting, she is still dictating things in a sense -- if I'm going to host, that I'm only going to see my dad for an hour.
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Talking this through and writing this out -- if I'm going to give these ultimatums, I need to understand the consequences. Based on the past decade of precedent, I was naive to think my dad's wife would just roll over and let us host. I just hate that time spent with my dad is the consequence.
Learning curve for me this year as well I guess.
But based on everything else I've written, I'm still holding firm. My brothers are in lockstep with me. We are going to do a "pasta bar" on Christmas Day -- three pastas, three sauces, three meat toppings, three other toppings. Eat as much as you want. A new family tradition. I hope my dad makes it.