If X is the brother of the son of Y's son, how is X related to Y?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Grandson
The relation is read from the end of the sentence backwards, one link at a time:
Y’s son — a son of Y, one generation below Y.
The son of Y’s son — a son of that son, two generations below Y: Y’s grandson.
X is the brother of that grandson:
So X is another son of Y’s son.
The word “brother” tells us that X is male, so X is Y’s grandson.
