DH and I missed out, but this last week there was a family reunion of sorts at my grandparents' lake house. My grandparents aren't in as great health as they used to be anymore (they're both in their 90s) so everyone tries to help out as much as possible, but grandma just can't let other people do the cooking/dishes/whatnot, so she putters around the (not all that huge) kitchen trying to help while other family members do the actual cooking. In short: mealtimes are busy, crowded, and a bit crazy with eleven people all there at once:
Grandma and grandpa
My brother and SIL
My aunt, uncle, and their two boys (~8 and ~10)
SIL is allergic to peanuts. My parents made sure grandma and grandpa knew this ahead of time, and even though they're not used to working around allergies (it just wasn't a thing for their generation), with my parents' help they were able to plan a menu which wouldn't involve peanuts or ingredients processed near peanuts. This takes a bit of foresight and some specific brand-hunting, but it's doable.
Enter SS aunt: every time we see her she has a new "medical condition." None of these conditions are ever diagnosed by a doctor, and they're usually reflective of whatever public health fear is going on at the time. I'm not going to say that they're all imagined, but I will point out that the probability of the miracle-cure-of-the-month actually coinciding with her medical needs this often is probably pretty low.
Anyway, SS aunt waits until she gets to the lake house to announce that she no longer will consume gluten. Except she "doesn't want to be a bother," so she doesn't want grandma to know. She then does her own shopping trip (throwing off some other family plans in the process) and proceeds to stake out half the kitchen preparing her own not-at-all-related-to-the-menu meals every time the family is ready to eat. Since it's not a large kitchen, this means that grandma and one or two other cooks are preparing food for 10 people in one half of the room and she's preparing food for just herself in the other half.
The kicker is, if she had only let someone know ahead of time, my parents and grandparents would have happily worked gluten-free options into the menu as well. (There probably WERE plenty of gluten-free things, but she was doing all her own meals entirely from separate ingredients - it's not like she was willing to eat the meat but just substitute in another starch, for example.) And in "not being a bother" and buying her own groceries, she made things much more difficult for my SIL, who no longer could assume that the kitchen was peanut-free.
My parents left over the weekend, but another of my cousins was coming up yesterday - and she's allergic to gluten too. Except she's open about it, she called ahead of time to make sure it wouldn't be a problem, and Grandma is expecting to be making gluten free alternatives (for one) each meal. Mom said she had a word with SS aunt before she left, suggesting perhaps she should actually TELL someone about her dietary needs, so Grandma would know to make *two* gluten-free portions each meal and would stop assuming SS aunt is hogging half the kitchen just to be SS.