A is son of C while C and Q are the sisters to one another. Z is the mother of Q. If P is the son of Z, Which one of the following statements is correct ?

Pointing at a photo, Dinesh said, "His father is only son of my mother." The photo belongs to- :

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.

A man said to a lady, "The son of your only brother is the brother of my wife." What is the lady to the man.

If A is the brother of B and K, D is the the mother of B and E is the father of A. Which one of the following statement is not definitely true ?