Overdose scene
At one point it shows an open bottle of drugs, hinting that someone had overdosed. Also at somepoint midway through the movie, the narrator states that the son did what the father did. I think the father had previously run his car off a bridge after drinking, when the son was young. The son subsequently committed suicide, and was not really there at all. The mother eventually killed herself with guilt. In her mind, she was trying to bring the son back. The entire family was doomed.
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