My mother's mother's only son — Aptitude Question
My mother's mother's only son: Introducing a man, a woman said, 'He is the only son of my mother's mother.' How is… Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 75 seconds
Question
Introducing a man, a woman said, 'He is the only son of my mother's mother.' How is the woman related to the man?
Options
- Sister
- Niece
- Daughter
- Aunt
Show the answer and the worked solution
Correct answer: B. Niece
Worked solution
- 'My mother's mother' is the woman's grandmother.
- That grandmother's only son is the woman's maternal uncle.
- So the woman is his niece.
Answer: Niece.
The idea
Note the direction the question asks for. The man is her uncle, so she is his niece — answering 'uncle' would be describing the wrong person.
Shortcut. Mother's mother's only son is the maternal uncle in one hop; then reverse the direction the question asks — a woman is her uncle's niece.
Common trap. "Sister" — dropping one 'mother's' and reading 'the only son of my mother', which would make the man her brother.