Trees Die Standing (1971)

An elderly millionaire woman spends her last days longing to see her grandson and his fiancée. Her acquaintances attempt to fulfill her wish, but news arrives that her grandson has died in a plane crash. Knowing that she has never seen her grandson since he was a child, the elderly woman chooses a young mechanic as her heir and introduces a young woman as his fiancée. The elderly woman experiences some improvement in her condition, but during a real accident, she becomes aware of the truth. Meanwhile, her grandson arrives and reveals that he was not on that plane. The elderly woman confesses that she knew the truth all along but still wants the young mechanic and the girl who is now truly his fiancée to remain in her family.

Unfortunately the movie Trees Die Standing is not yet available on HBO Max.