Change the narration: The old lady said to her son, "Is it not your duty to help me in my old age?"
Q1. Change the narration: The old lady said to her son, "Is it not your duty to help me in my old age?"
Answer: The old lady asked her son if it was not his duty to help her in her old age.
Explanation: In indirect speech, a rhetorical yes/no question introduced by "Is it not..." is reported using "if/whether," and pronouns and tenses shift to match the reporting context.