My grandfather's only son — Aptitude Question
My grandfather's only son: Pointing to a lady, a man said, 'She is the daughter of my grandfather's only son.' How… Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 60 seconds
Question
Pointing to a lady, a man said, 'She is the daughter of my grandfather's only son.' How is the lady related to the man?
Options
- Sister
- Cousin
- Niece
- Aunt
Show the answer and the worked solution
Correct answer: A. Sister
Worked solution
- The grandfather's only son is the speaker's father.
- The lady is his father's daughter.
- She is his sister.
Answer: Sister.
The idea
Work outwards one relation at a time, naming each person as you resolve them. Two steps settle most photograph questions.
Shortcut. Replace 'my grandfather's only son' with 'my father' in one step; the sentence becomes 'the daughter of my father' — his sister.
Common trap. "Cousin" — treating the grandfather's son as an uncle; with the word 'only', that son can only be the speaker's own father.