A is father of X; B is mother of Y. The sister of X is Z and Y. Which of the following statements is definitely not true ?

B is the mother of Z
X is the sister of Z
Y is the son of A
B has one daughter E. B is the wife of A

The correct answer is: B. X is the sister of Z.

Explanation:

  • A is the father of X.
  • B is the mother of Y.
  • The sister of X is Z and Y.

From the above information, we can infer that:

  • X and Z are siblings.
  • Y is the brother of X and Z.
  • B is the mother of X and Z.
  • A is the father of X and Z.

Therefore, the statement “X is the sister of Z” is definitely not true.

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