Question 69

Logical Reasoning Blood Relations Medium

Introducing a man to her husband a women said, "His brother's father is the only son of my grandfather." How is the women related to this man?

(A) Mother
(B) Aunt
(C) Sister
(D) Daughter
✓ Correct Answer: Option C Verified Solution

📘 Step-by-Step Solution & Detailed Explanation:

Family Relation Graph

Family Relation Graph — visualization

Graph for: "His brother's father is the only son of my grandfather." The diagram below shows how the persons relate; it highlights that the woman and the man share the same father (so they are siblings).

Grandfather (only son = Father) Father Woman (speaker) Husband (woman's spouse) Man (introduced) Man's Brother (brother) parent children Same father ⇒ siblings Legend: • Solid grey arrow = parent → child • Dashed red line = spouse • Green box = shows equality used in reasoning
Interpretation used in diagram:
  • "His brother's father" = the father of the man's brother → this is the man's father (shared father).
  • "The only son of my grandfather" = the woman's father.
  • Equating the two gives: man's father = woman's father ⇒ they are siblings ⇒ woman is the man's sister.

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