What are the rules on significant other invitations of brothers and sisters and bridal party? My fiance is the oldest. I am the youngest. My brother and sister will both get their plus one as both will be in the wedding party. He has a sister (24), brother (22), brother (22), and brother (16). All have boyfriends/girlfriends. We're doing a destination wedding. Do I need to extend the plus one to all of them, or can I limit it to his sister? We're close with her boyfriend, but barely know (or haven't met) the others. His whole family is in the wedding party.
Along those lines, do we need to extend the plus one to everyone in the bridal party?