Question

$P$ is the brother of $Q$ and $R$. $S$ is $R$'s mother. $T$ is $P$'s father.
Which of the following statements cannot be definitely true?

• A. $T$ is $Q$'s father.
• B. $S$ is $P$'s mother.
• C. $P$ is $S$'s son.
• D. $T$ is $S$'s husband.
• E. $Q$ is $T$'s son.

Answer 1

Answer: (E)

$Q$ is $T$'s son.

$P$, $Q$,$R$ are children of same parents. So, $S$ who is $R$'s mother and $T$, who is $P$'s father will be mother and father of all three. However, it is not mentioned whether $Q$ is male or female.

So, (E) cannot be definitely true.

option E.