In fact, all of this is a conspiracy of Death.
If the heroine had only regarded her precognitive ability as a nightmare and actively sought treatment for her excessive dreaming, she might have recovered, or she might have been tortured to death by a mental breakdown. In the end, maybe only she would have died. However, the heroine finally chose to verify the dream. She saw that the blonde woman in the dream was her own grandmother. In the dream, her grandmother and grandfather died in a high-altitude observation deck restaurant. But in reality, her grandmother was not only alive, but also the mother whom her uncle could never forgive and didn't want to mention. It wasn't until the heroine met her strange grandmother in a heavily fortified safe house in the wilderness that she finally believed that those targeted by Death would die. Her grandmother witnessed the tragedy at the observation deck restaurant and saved everyone, but hundreds of people that night died one after another in strange ways, leaving only her and a little boy. Her grandmother never left the cabin for life, researching on her own and realizing that it would harm the bloodline. To make her granddaughter believe, her grandmother sacrificed herself to show... I still think that if her grandmother still didn't leave the safe house, wouldn't the bloodline be spared? Unfortunately, her grandmother was dying of cancer. She was eager to tell her granddaughter to find the pattern, observe the details to protect the family, and find a way to survive.
Only then did the heroine start to study her grandmother's thick notes and find the pattern and order. However, her family didn't believe her. Her uncle was the first to die tragically under a lawnmower. According to the order, it should have been the tattoo artist cousin. Unexpectedly, it was the second cousin who died. As predicted by the heroine, she was hit in the face by a football, thrown into a garbage truck, and finally crushed. The reason why the cousin survived in the tattoo shop was that his mother had an affair, so he was not a blood relative of the heroine's family. Thus, the order came to the third cousin. They all went to find the grandmother's friend, the last surviving black boy from that year. The answer he gave was that one could avoid Death's call by having someone die in one's place or by dying and coming back to life. As a result, the reckless cousin, taking the scared third cousin with him, died in the CT room. [The magnetic force was so strong that all the studs and rings on the cousin, along with himself and his wheelchair, were sucked into the CT machine. The third cousin was also killed by a spring from a vending machine outside the door that pierced his brain.]
In the end, only the heroine and her mother and brother were left. They planned to send the heroine's mother to the grandmother's cabin to keep her safe, but the mother still died. They thought that the heroine's drowning and revival would break the rumor of the bloodline curse. Unfortunately, the heroine's heart didn't stop when she drowned, so the sister and brother died under the huge tree caused by the derailed train... After watching the Final Destination series, I pay more attention to the surrounding environment and details. Life is precious.