Johnny's father is the brother-in-law of Nisha's only sister. How is Johnny related to Nisha?

Introduction / Context:

This family-relation question uses the term "brother-in-law", which can have more than one meaning in everyday language. The puzzle asks you to connect Johnny, his father, Nisha and Nisha's only sister. You must select the most natural and exam-standard interpretation of "brother-in-law" to determine how Johnny is related to Nisha.

Given Data / Assumptions:

• Johnny has a father; call him JF.
• JF is the brother-in-law of Nisha's only sister.
• Nisha has exactly one sister; call her S.
• "Brother-in-law" in such questions usually refers to either:
  • the husband of one's sister, or
  • the brother of one's husband.
• We must find Johnny's relationship to Nisha.
• We assume the standard exam convention that the most direct and simple interpretation is intended unless additional details force another reading.

Concept / Approach:

The key is to decide which person S's brother-in-law most naturally refers to. Because S is Nisha's only sister, S's brother-in-law is very typically Nisha's husband (the husband of her sister), rather than a more distant relation like the brother of S's husband. If we take JF as Nisha's husband, then Johnny becomes Nisha's son. This gives a clear and common exam-style solution.

Step-by-Step Solution:

Verification / Alternative check:

If we instead try the less direct interpretation, where JF is the brother of S's husband, then JF need not have a simple, named kinship relation to Nisha (he would be a more distant in-law). The question, however, offers "son", "grandson", "father", and "cousin" as options, which strongly suggests a direct, simple relation. The "Nisha's husband" reading is the only one that yields such a direct relationship, confirming that "son" is the intended answer.

Why Other Options Are Wrong:

Johnny is not Nisha's grandson, because we have no indication that Nisha is old enough or in the grandparent generation.

He cannot be her father; that would reverse the generation implied by the chain through Johnny's father.

"Cousin" does not fit either, as cousins share grandparents but are in the same generation; the question clearly places Johnny one generation below Nisha's husband.

Common Pitfalls:

Students often get stuck on the multiple meanings of "brother-in-law" and overcomplicate the family tree. A good strategy is to first test the simplest interpretation that directly connects the named people. In this case, reading "brother-in-law of Nisha's only sister" as "Nisha's husband" gives a smooth and exam-friendly solution. Only if that fails should you try the more complex alternative.

Final Answer:

Johnny is related to Nisha as her son.