Brother of Y's son's son — Blood Relations Aptitude Question
Brother of Y's son's son: If X is the brother of the son of Y's son, how is X related to Y? Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 60 seconds
Question
If X is the brother of the son of Y's son, how is X related to Y?
Options
- Son
- Grandson
- Nephew
- Brother
Show the answer and the worked solution
Correct answer: B. Grandson
Worked solution
- Y's son's son is Y's grandson.
- X is that grandson's brother, so X is also a child of Y's son.
- X is Y's grandson.
Answer: Grandson.
The idea
Read the phrase from the inside out. Siblings share a generation, so a brother of a grandson is another grandson.
Shortcut. Count generations: a son's son is two below Y, and a brother stays on the same level, so X is two below Y — a grandson.
Common trap. "Son" — dropping one 'son of' and making X the brother of Y's son, which places him only one generation down.