Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-15951496-20130821035731/@comment-4280498-20130821060056

Technically all three of them did sacrifice themselves. The Nemeton did get it's power back. Killing their parents would've done nothing except making Jennifer powerful like all the others. The 12 people she killed were used through the Nemeton to give her power. Jennifer didn't realize this, which is why she still thought about killing them. She thought the Nemeton already had all its power back.

And they did know where it was, but the storm blinded them, so it was harder to find.