Question

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. B is the brother of A
• B. B is the son of D
• C. A is the brother of C
• D. C is the brother of A

Answer 1

Answer: (D)

C is the brother of A

From the question it is very clear that A, B and C are children of D and D is their father.
A and B are brothers of C. However, the gender of C is not known.
Therefore nothing can be said about C. Hence, option D is definitely not true.