B and D — Blood Relations Aptitude Question
B and D: B is the husband of P. Q is the only grandson of E, who is the wife of D and the mother-in-law of P. Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Hard
- Time target: 120 seconds
Question
B is the husband of P. Q is the only grandson of E, who is the wife of D and the mother-in-law of P. How is B related to D?
Options
- Son
- Son-in-law
- Nephew
- Brother
Show the answer and the worked solution
Correct answer: A. Son
Worked solution
- E is P's mother-in-law, so E is the mother of P's spouse.
- P's spouse is B, so B is E's son.
- E is D's wife, so D is B's father.
- B is D's son.
Answer: Son.
The idea
Mother-in-law of P means mother of P's husband. Resolving that one phrase unlocks the whole chain.
Shortcut. P's mother-in-law E is the mother of P's husband B, and D is E's husband, so D is B's father. Q is never needed.
Common trap. "Son-in-law" — carrying 'in-law' over from 'mother-in-law of P'; that relation belongs to P, while B is E and D's own son.