What are you trying to ask? Or am I just to stupid to see what you are trying to ask.....
The audience knows that Romeo can hear Juliet, but she doesn't know this.
This is an example of D. Dramatic Irony.
This is because dramatic irony is when the reader, viewer, or audience knows something that the character in a story does not.
Hope this helps! :)
Answer:
Family secrets shouldn't be told outside of the family because whoever told ypu that secret trusted you alot to keep the secret and just as you gained there trust you can lose it.