Looking at a portrait of a man, Sandeep said, "His mother is the wife of my mother's only son. Brothers and sisters, I have none." How was the man in portrait was related to Sandeep’s Wife?

Looking at a portrait of a man, Sandeep said, "His mother is the wife of my mother's only son. Brothers and sisters, I have none." How was the man in portrait was related to Sandeep’s Wife? Correct Answer Son

Using following notations:

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[ alt="Blood zahida" src="//storage.googleapis.com/tb-img/production/19/04/Blood_zahida.PNG" style="width: 215px; height: 250px;">

Since, Sandeep has no brother or sister, so he is his mother's only son. Now, wife of my mother's son -- my wife. So, Sandeep's wife is the man's mother, or the man is Sandeep's son.