Well, let me give the first enthusiastic review - I really liked this one. This brand of psychological horror, which is both believable and highly disturbing, is my favorite brand of horror.
I did have a lot of the same questions at the end that Kaa did - especially regarding the brother. There seemed to be a progression with the recordings, in that the father's death was almost certainly an accident, and then, while I thought the mother was genuinely attempting suicide, it was clear the girl (whose name I forgot, dang) could have helped her but didn't (and, since the mother was shocked, maybe she was really hoping to be saved, as many suicide attempters are). But the brother - why record him when he's just going to enter a car, if you know nothing is going to happen?
My interpretation was that after the accidental death of her father, and the accidental recording thereof, she started in her obsession of recording intimate moments - including the deaths of her loved ones. It was more important to her to record her mother than help her. She may have killed her brother, or she may have recorded everything he does in order to ensure she'll get his last moment, or it may have been a coincidence that she got that moment. I'm leaning towards the first option, but I like that it was left ambiguous. And I like that the ending was left ambiguous too. Was she going to kill the narrator? Or did she finally break out of the pattern? The horror, for me, isn't in either of those possibilities. It is in not knowing. I entirely disagree with heyes here - I think this story ends at the perfect moment. No matter what happens next, if we could see it, this story would not belong in Pseudopod, it would belong in a soap opera. Ending it at this point is what makes this story so chilling.