The kids (spoilers)
First of all, I don't dislike this movie. It was effectively creepy and well done. But there's something that bothers me. It's about the kids. (And it's not about how they're somehow able to stage a fake hanging without killing themselves in the process.)
When I watched the movie I did not initially "get" the twist (i.e. that it was all a prank). It was only when reading reviews afterwards that I finally realized what happened. And I don't think it's because I'm stupid. (I'm pretty sure I'm not.) It's because the kids' actions were totally out of character with how they are portrayed in the first half of the movie, so the twist did not make any sense to me.
To do what they did... to come up with this idea, methodically plan it for weeks in advance, and then execute it so thoroughly... knowing that they are "pranking" a young woman who has been through an extremely traumatic childhood... someone who has only been nice to them... someone they have been living in a house with for days and getting to know... is COLD on a psychopathic level. It requires that they basically have zero human empathy. This is the sort of thing about which they write articles in psychology journals.
Yet that's not how they're portrayed in the movie. The daughter is obviously emotionally devastated by her mother's death. The son obviously cares about his sister very much, and shows a lot of empathy towards her. They're not bad kids. They seem very normal. Struggling with the death of the mom, yes; but basically decent kids who have the capacity to love each other, their parents, and, presumably, others, too.
So what they did, for me, is completely out of character with how they are presented in the movie. This wasn't an "in the moment" outburst or poor decision. This was methodical. This was calculated. This was pure evil.
In a way, I understand why the film makers had to do this. They couldn't portray the kids as evil early on, because it would risk giving away the twist. But by portraying them as normal, well-adjusted, and compassionate individuals, the twist "worked"... but it also didn't work, IMO, because it was based on a lie.
Thinking back on "The Sixth Sense": The twist in that worked. Even in retrospect, it all makes sense. I don't feel the same way about "The Lodge", though. To me the twist in this does not work, because it requires completely ignoring the characterization of the kids in the first half of the movie.
Just wanted to get that off my chest. Feel free to disagree.