Pointing to a girl Sandeep said, "She is the daughter of the only sister of my father." How is sandeep related to the girl?

A is the brother of B. B is the brother of C. D is the father of A. Based on these three statements, which of the following statements cannot be definitely true? 

A woman introduces a man as the son of the brother of her mother. How is the man related to the woman? 

Jayant introduces a man to his friend as his wife's father's son. The man is Jayant's _____

Direction: Study the information carefully and answer the given questions.
R is father of S. T is mother of W and sister of X. X is mother of S. There are three females in the family. Y is sister of S. 

How is R related to T? 

A is B’s daughter; B is C’s mother D is C’s brother. What is the relation of D with A?

Direction: Study the following information carefully and answer the questions given below:
Seven members are living in the family. Q is the daughter of P. B is the brother of R. G is the mother in law of A. B is married with A. B is the uncle of Q. D is the father of B.

What is the relation of B with respect to P?

Amit and Sohan have two brothers Manju Sohan and Amit's sister who has a son Ravi. So tell me how is Ravi related to Amit?