Thanks everyone for the responses - very interesting. I wanted to present the situation neutrally at first, but now I’ll give more context and try to answer some questions.
I am the allergic sibling. The Christmas get together is not just for one day but a week or so at my parents’ for Christmas/New Year’s. I live overseas and my three siblings are widely spread out, so this is often the one time of year we get to see one another. Already we’re seldom all there and I’m sure it’ll be harder when grandkids come along (there’s only one now, an infant), but (this issue aside) we are a close family and I think we’ll continue to try to get together when we can.
Yes, I take antihistamines and whatever other drugs are available to deal with the allergy. I have not taken shots, and am not sure they would work - no doctor has ever recommended them to me as an option.
Okay, now for some more real-life context/boring detail. (Just stick to the scenario in the OP if this is too long.) Some background to this is that my parents were also, until recently, pet owners. They got a dog when I graduated high school and left home. When I came back to visit they were always great about vacuuming ahead of time and keeping the dog locked away in one area while I was there. I never asked them to do so; they just did. I’d still usually get sick, but so be it: it was their home, I chose to come, and I was glad they got to enjoy a dog since they never could when I was living there.
Then my siblings started bringing their own dogs to our parents’. I guess everyone was used to me being sick anyway, so what’s another dog or two? I didn’t say anything except for the fact that they were much more blase about letting their dogs run around. While our parents nicely kept their dog sequestered somewhere to minimize my exposure to it, certain siblings thought it was just so cute when their pup would escape, run around the house, jump on the couch, and get hair everywhere. The implication was that I was heartless for not seeing how adorable this all was - as though my allergies were really just a deficiency of soul. I was nice about it, but had to remind them that that was not the case and that, cute or not, their dog actually made me sick.
Well, earlier this year my parents’ dog died. My two siblings who are coming for Christmas this year are still bringing their dogs. One sibling is staying for over a week and is short on cash, so I didn’t really expect she would pay for a kennel. Her dog is also little and she’s (now) not bad about keeping it locked away. I’ve still gotten sick, which sucks, but I’m used to it by now.
My brother is only coming for two nights (he lives the closest, about 3 hours away). He has a big dog that sheds a lot, and this year my parents suggested he get a kennel. This did not go over well. Fine, he’s bringing the dog, though it’s agreed the dog will stay in the basement.
Well, here’s the part that infuriates me: my brother and his wife arrive today and rather than bring the dog to the basement, they are adamant that the dog stay in the bedroom with them.
Why is this infuriating? Because as they well know, that is the room I will sleep in again when they leave. There’s limited space, and since they’re married and I’m not, I’m bumped to the couch while they’re here. My parents, ever eager to avoid conflict, say we’ll just air out and clean the room really well after they leave. I don’t think it’ll really work - as someone pointed out above, that stuff sticks in the air for a long time.
Does it matter? I’m already sick anyway, and though it helps somewhat to sleep in a dog-free room, the dander is so in the air that maybe it doesn’t *really *matter, other than psychologically. But they were so unaccommodating about it that it pissed me off and made me start reassessing the entire issue, hence the OP and desire for a reality check.
Okay, vent over. More opinions/thoughts still welcome.
tl;dr? Just go by the OP scenario. 