My fiancé and I dated 3 years before he proposed and the majority of that time I spent living on the same property and in close proximity with his 2 sisters. They are very quiet girls and never warmed up to me. I am very friendly. I am very close with the rest of his family but they are somewhat socially awkward and the youngest (16 now) has never had a conversation with me despite my many efforts. She replies "yeah" and looks away when I try to talk to her, never making eye contact. I've offered to drive her places, take her to dinner, take her shopping... But she only finds interest in Facebook, Twitter and YouTube. We have no relationship, is it still proper etiquette for me to have them in my bridal party? I have nothing against them, but I don't feel comfortable making them bridesmaids if we can't have a normal conversation. Is it okay for me to leave them out of the ceremony?
Also- my fiancé is in full support of me leaving them out, he feels they wouldn't know the difference.