So I just had a couple RSVP to the wedding via our email response. However, they were never sent an invitation to the wedding. We invited their daughter because she's a good friend of ours, but we sent the invitation to her separate address and never gave any indication that her parents were also invited. CT (my fiance) knows her parents a little but not well.
I'm guessing they just assumed they were included as well, but I have no idea how to handle this now. We're having a bigger wedding but can't afford to host many more people without breaking our bank.
My question is, how do you tell someone who thinks they're invited that they're not invited without being completely rude?