A Mexican needs help with Christening food ideas for my white in-laws?

If it is your christening, then don't try to please your white in-laws. Give them a taste of culture, perhaps something they have never tried before. Just have a few things like fruits and finger foods that will tide them over if they truly have weak stomachs or are afraid to explore. I always eat the food of the people who I visit and don't worry if I am going to like it or not. If I don't like something, I don't eat it, but one light meal isn't going to "starve" me.