Blood relations – decode the chain precisely: Pointing to a boy, Urmila said, "He is the son of my grandfather's only daughter." How is the boy related to Urmila?

Introduction / Context:
We translate a nested family description into a direct relation with the speaker (Urmila).

Given Data / Assumptions:

• "My grandfather's only daughter" ⇒ Urmila's mother (only female child of her grandfather).
• The boy is the son of that woman (Urmila's mother).

Concept / Approach:
Child of one's mother is a sibling. The boy is male, so he is Urmila's brother.

Step-by-Step Solution:

Verification / Alternative check:
Had the phrase been "grandmother's only daughter" it still points to mother if she is the only daughter. Either way, the boy remains a son of the mother ⇒ a brother.

Why Other Options Are Wrong:
"Cousin/Nephew/Uncle/Son" imply different branches or generations not supported by the chain.

Common Pitfalls:
Misreading "only daughter" as "only child" and overcomplicating with cousin branches.

Final Answer:
Brother