My fiance and I are experience a somewhat difficult decision. His uncle called and requested that we not serve shellfish at our wedding reception because his wife is very allergic to them. Apparently she cannot even be in the same room as them. My fiance told his uncle that we had not yet decided on a menu, and that he did not feel like this was ultimately his decision, since my parents are the ones planning and paying for the reception. He said we would take the request into consideration, however. My fiance's parents and my parents find this request unreasonable, as do we. We are having 250 people at our wedding, and it seems a little ridiculous for his uncle to ask that we cater to the needs of one person. At the same time, family is important, and we do not want to hurt anyone's feelings or burn any bridges. We now feel that if we do not honor this request, we will keep them from coming to the wedding. At the same time, I think it was poor etiquette to make this request. Any advice as to what to do in this situation?