Here is a kinship problem whose response is very curious. Uncle Ruben was in the big city to visit his sister Mary Ann. They walked together along a street when they passed a small hotel.
- "Before we leave," Ruben told his sister, "I would like to stop for a moment and ask for a sick nephew who lives in this hotel."
- "Good," Mary Ann replied, "since I don't have any sick nephews to worry about, I'll go home. We can continue our walk this afternoon. ”
What was Mary Ann's kinship relationship with that mysterious Ruben's nephew?
Mary Ann was the mother of the sick boy.