So I was discussing invites with FH and suggested that anyone who wasn't in a relationship would get 'and guest' added to their invite in case they wanted to bring someone. He jokingly asked if we were doing that for my Grandma and I laughed and said no (even though Gram might have a hot date, who knows?) But that got me thinking, who did you add 'and guest' to on the invites? Did you add it as a courtesy even for people you're 99.99% sure won't bring dates? And how young is too young for a plus one? (FBIL is 16 and wants to bring his girlfriend)