The main characters are a brother and his sister, and the sister is blind, but she doesn’t use a cane.
The sister was about to be taken to an orphanage, but the brother didn’t know what was going on; only the sister was aware.
They were sent to live with a woman (like an aunt or guardian) who had a boy who had been missing for 10 years and she claimed he was her brother.
The boy had been living with her all those years and gradually became strange and frightening.
The movie has mystical or supernatural elements.
The woman gave the brother a room with a bench for weightlifting, and she deliberately poured her urine on his pants, making him think he had wet himself, as part of her manipulations.
The atmosphere of the film is a horror/mystery thriller, with tension and scary moments.