Change the narration: The old lady said to her son, "Is it not your duty to help me in my old age?"
- The old lady asked her son if it was not his duty to help her in her old age
- The old lady asked her son that was it not his duty to help her in her old age
- The old lady asked her son if it were not his duty to have helped her in her old age
- The old lady had asked her son if it was not his duty to help her in her old age.