Blood relations – father’s line to find sibling: Introducing Rajesh, Neha said, "His brother's father is the only son of my grandfather." How is Neha related to Rajesh?

Introduction / Context:
We equate "his brother's father" to "his father," and match that to "the only son of my grandfather," which is Neha's father. Then we compare Rajesh and Neha.

Given Data / Assumptions:

• "His" refers to Rajesh.
• His brother's father = Rajesh's father.
• Only son of Neha's grandfather = Neha's father.

Concept / Approach:
If Rajesh's father is the same person as Neha's father, Rajesh and Neha share a father ⇒ they are siblings. With Neha female, she is Rajesh's sister.

Step-by-Step Solution:

Verification / Alternative check:
Even if mothers differ, sharing the same father still yields the sibling relation for these puzzles.

Why Other Options Are Wrong:
Daughter/mother/niece require extra generational steps not stated.

Common Pitfalls:
Misreading "only son of my grandfather" as an uncle rather than her father.

Final Answer:
Sister