The son of the daughter of my uncle's father — Aptitude
The son of the daughter of my uncle's father: Introducing a boy, a girl said, 'He is the son of the daughter of the… Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Hard
- Time target: 120 seconds
Question
Introducing a boy, a girl said, 'He is the son of the daughter of the father of my uncle.' How is the boy related to the girl?
Options
- Brother
- Nephew
- Uncle
- Son-in-law
Show the answer and the worked solution
Correct answer: A. Brother
Worked solution
- The father of the girl's uncle is her grandfather.
- The grandfather's daughter is the girl's mother.
- The son of her mother is her brother.
Answer: Brother.
The idea
Three nested relations, resolved one at a time from the innermost. Naming each person as you go keeps the chain straight.
Shortcut. Net generations: uncle (+1), his father (+2), that man's daughter (+1), her son (0). The boy is on the girl's own level and male, so brother among the options.
Common trap. "Nephew" — reading 'the father of my uncle' as 'my father', which makes his daughter the girl's sister and the boy her sister's son.