Who is the grandfather? — Blood Relations Aptitude Question
Who is the grandfather?: In a family: A is B's father, B is C's mother, C is D's sister and E is A's wife. Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 75 seconds
Question
In a family: A is B's father, B is C's mother, C is D's sister and E is A's wife. How is E related to D?
Options
- Mother
- Aunt
- Grandmother
- Sister
Show the answer and the worked solution
Correct answer: C. Grandmother
Worked solution
- B is the mother of C, and D is C's sibling, so B is D's mother too.
- A is B's father and E is A's wife, so E is B's mother.
- E is therefore D's grandmother.
Answer: Grandmother.
The idea
Draw the tree: generations top to bottom, spouses side by side. Two lines of a diagram beat four sentences of reasoning.
Shortcut. Count generations: A and E sit two above C and D (A → B → C, D), so E, a woman, is the grandmother.
Common trap. "Mother" — E is B's mother; transferring that relation to D skips a generation.