Looking at a portrait of a man, Sanjay said, "His mother is the wife of my father's son. Brothers and sisters I have none." At whose portrait was Sanjay Looking.

Explanation:-

Since, Sanjay has neither a sister nor a brother, therefore, Sanjay is the only son of his father. Hence, the mother of the portrait is wife of Sanjay. Therefore, the portrait is the wife of the Sanjay. Therefore, portrait was of Sanjay's son.