Introducing A man, a woman said. He is the only son of my mother ' s mother. How is the woman related to the man?

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? 

Saloni is the daughter of the only son of Kartik. Nirupama is the mother of Deepak. Yamini’s only son, Ankit, is married to Nirupama. Kartik is the paternal grandfather of Deepak. How is Kartik related to Ankit?

X is the son of Y. Y is Z's wife. W is the father of Z. So Y will be W.

Direction : Study the following information carefully and answer the question given below:
(i) ‘P ×Q’ means ‘P is sister of Q’.
(ii) ‘P÷Q’ means ‘P is mother of Q’.
(iii) ‘P – Q ‘ means ‘ P is father of Q’.
(iv) ‘P ÷ Q’ means ‘ P is brother of Q’.

Which of the following represents ‘M is nephew of R’?

Pointing to a picture, Mahesh says that she is the sister of my son's mother. What is the relation of the person in the photograph to Mahesh?

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? 

Read the following information carefully and answer the questions given below.
'3+2' means '3 is the father of 2'.
'3 – 2' means '3 is the sister of 2'.
'3 × 2' means '3 is the husband of 2'.
'3 ÷ 2' means '3 is the wife of 2'.

In a certain code language, "come at once mother very sick" is written as "XLNV ZG LMXV NLGSVI EVIB WJXP". What is the code for "sister"?