Why in the world do people not think through their actions. It's a simple rule - treat your first cousins who are adults the same. 1.all adults get their own invites (no exceptions) 2. If you can afford it ALL cousins are treated the same and get a plus one. 3. If you can't afford to invite a plus one for all cousins than cut it by those who are engaged to married or live together, and ALL dating cousins do not get a plus one. Doing differently can be hurtful within a family. Why make a happy occasion that way. Follow the simple rule.