Blood relations – identifying in-law term: A lady meets a person in the market who is the wife of the brother of her husband. How is the lady related to the person?

Introduction / Context:
This is a straightforward in-law identification. The person met is "the wife of the brother of her husband."

Given Data / Assumptions:

• Her husband has a brother.
• The person is that brother's wife.

Concept / Approach:
The wife of one's husband's brother is commonly called a sister-in-law.

Step-by-Step Solution:

Verification / Alternative check:
All cultures may vary in specific terms, but aptitude puzzles use standard English kinship: brother’s wife = sister-in-law.

Why Other Options Are Wrong:
Cousin/sister/niece/aunt do not follow from the specified spousal link.

Common Pitfalls:
Confusing whether the sister-in-law is via one’s own sibling or spouse’s sibling; both are sister-in-law.

Final Answer:
Sister-in-law