Introducing a boy, Amar says, "He is the son of the only daughter of my maternal grandmother." How is the boy related to Amar?

Introduction / Context:

This blood-relation question involves the phrase "only daughter of my maternal grandmother". You must decode that phrase to identify who this daughter is in relation to Amar, and then connect the boy to Amar accordingly. It is a good test of understanding maternal grandparents and how their children relate to the speaker.

Given Data / Assumptions:

• Amar is speaking.
• He introduces a boy and says: "He is the son of the only daughter of my maternal grandmother."
• "Maternal grandmother" means Amar's mother's mother.
• The "only daughter" of Amar's maternal grandmother is his mother, assuming she is the only female child.
• The boy is the son of Amar's mother.
• We assume that Amar himself is a child of his mother, and that the boy is another child of the same mother.
• We must find how the boy is related to Amar.

Concept / Approach:

The key insight is that "only daughter of my maternal grandmother" is a roundabout way of saying "my mother". Once we interpret the phrase this way, the boy becomes "the son of my mother". The son of one's mother is either oneself or a brother. Because Amar is introducing the boy as someone else ("He is the son..."), the boy cannot be Amar himself, so he must be Amar's brother.

Step-by-Step Solution:

Verification / Alternative check:

Consider an example. Amar's maternal grandmother (GM) has just one daughter, A's mother M. M has two sons: Amar and Ravi. For GM, both Amar and Ravi are grandsons. For Amar, Ravi is "the son of the only daughter of my maternal grandmother", that is, the son of M. When Amar introduces Ravi using that phrase, Ravi is clearly his brother. This fits the situation described in the question exactly.

Why Other Options Are Wrong:

"Cousin" would be correct if the boy were the son of Amar's aunt (another daughter of the grandmother). But the grandmother is said to have only one daughter, which is Amar's mother, so this cannot represent a cousin relation.

"Father-in-law" is an in-law relation that has nothing to do with the generational structure described; the boy is clearly in the same generation as Amar, not a generation above.

"Nephew" would describe the son of Amar's sibling, but the description points to the son of his mother, making the boy his sibling rather than his sibling's child.

Common Pitfalls:

Some students misread "maternal grandmother" and imagine that the "only daughter" might be an aunt, but the wording "only daughter" combined with "my maternal grandmother" usually implies that the mother is that unique daughter. Also, they may forget that the phrase "He is the son of my mother" cannot refer to Amar himself, because he uses "He", indicating another person. Recognizing this helps you choose "brother" rather than the more generic "son of my mother".

Final Answer:

The boy introduced by Amar is his brother.