Nell (2003)

Nell, a bitter vengeful old woman seeks revenge on her neighbour, Brid Doyle, for stealing her true love, Michael, many years ago. When Michael dies, Nell feels free to launch her attack. Her revenge is sought in the lowest fashion imaginable, using Brid's own son, Sonny. She uses his weakness to her advantage, capitalising on his misfortune, to drive him into dangerous and deadly actions. The cycle of retribution continues...

Unfortunately the movie Nell is not yet available on HBO Max.