Well, you don't just have to wait and wonder. You can contact the parents, either by phone (my preference) or email.
That's what I do whenever I don't get rsvp's. Which is often - it's a modern phenomenon, unfortunately.
Agreed. If you really need to know, just contact the households for confirmation.
I acknowledge a host shouldn't
have to do this, because people should reply; but when people
don't reply, it's such a simple thing for the host to do (usually), and if they really need an exact head count, contacting the guests to ask will save the host a lot of angst.
To avoid getting into a discussion about whether the 12-13 year old can RSVP for themselves--just say you're calling to
confirm, because you need to be absolutely certain as to the final number. You can talk to either the girl or the parent, whoever answers the phone--if someone says yes at this point and then doesn't show, I think they are being either rude or clueless.