at a family event where they are treated as nothing more than an irritation by other family members?
This person, let's call them 'Sally', is always invited to family gatherings at a house where there is a dog and a cat. Sally is badly allergic to them and doses up on antihistamines before going. The problem is that even so, she still breaks out in a highly visible rash when they get too close.
Despite politely mentioning this, she has been told that it's too difficult to keep the pets out of the room and elsewhere. This is a multi-bedroomed house that also has a garden.
Would I be unreasonable to point out that new-fangled invention, the door next time it happens? Just to make it clear, Sally doesn't invite herself, but there are in-law relations to her (though blood relations to me). Sally would be quite able to do this for herself, but she doesn't like to rock the boat with her inlaws who are (to my mind) acting unforgivably badly as hosts. I've had just about enough of standing by and watching it and am anticipating a bit of a showdown to be honest...
And let the flaming commence... ;-)