My brother and his fiancé are getting married in the fall. I've grown quite close to my future sister-in-law and she asked me to be a bridesmaid. The awkward part is that I have a dairy allergy that didn't develop until I was a late teen and in is often forgotten about by my brother.
When the talk of food at the wedding came up, my mother privately asked him about food options and he informed her that "there'll be stuff for [me] to eat". I'm deeply concerned about being able to actually eat anything, as dairy is often added to dishes in small amounts unexpectedly. If the venue (who is catering the wedding) is unaware of the allergy, all the dishes my brother thinks are okay may be far from it. Normally in situations such as these I bring my own food/snacks to get by, however the venue doesn't allow *any* outside food whatsoever and I am not sure how I will make it through the evening.
Not being able to eat is a huge problem but I don't want to make things difficult for my brother and his fiancé. If I had realized that this would actually be a problem earlier, I would have bowed out of the wedding party but now I've committed and don't want to let his fiancé down.
What do I do??