For you guys stuck on the sister thing, It comes up during your conversation with the crone. When you (mc) tell her you know something about why she's holding information from you it takes you to the clue page. If you choose a wrong clue she says your 'thoughts are empty'. Stop. backup to the clue page and select another clue. Only the right clues let you go forward and then it makes sense. You have to pick several clues in order to proceed. It is not a hard puzzle. . .and it tells a story.
BTW, Belle, great story writing. I can feel the plot is really starting into the 'third reel'. And the new 'front page' is amazing. (not sure about that site you reference though. doesn't look organized and very 'third world')