One more thing I was thinking about. The mother's face goes from totally messed up to 100% fine all at once. That's highly suspicious and feels like a clue, but I don't know what it means. Although the kid is seriously messed up, I was actually never fully convinced that the mother *wasn't* up to something as well,…

Saw this last night and thought I'd throw one more log on the crazy theory fire, because I don't think I've seen this particular theory in the discussion below.

She was on pills to help her sleep. She takes one just before the twins crawl out from under the bed. It also explains the cockroach in her mouth without her waking up.