Pointing to a lady, someone says: “She is the wife of my grandfather’s son.” How is that lady related to the speaker?

Introduction / Context:
Statements like “wife of my grandfather’s son” can describe two different people depending on whether “my grandfather’s son” is the speaker’s father or the speaker’s paternal/ maternal uncle. Without a distinguishing clue, the relationship cannot be uniquely determined. This item tests whether you notice such ambiguity and avoid jumping to a single answer.

Given Data / Assumptions:

• Speaker references “my grandfather’s son.”
• That person could be the speaker’s father or the speaker’s uncle (since both are sons of the grandfather).
• The lady in question is the “wife” of that son.
• No extra hints are provided to identify which son is intended.

Concept / Approach:
Enumerate possibilities and see if the options converge on a single relationship. If “my grandfather’s son” = my father, then “wife of my grandfather’s son” = my mother. If “my grandfather’s son” = my uncle, then “wife of my grandfather’s son” = my aunt (uncle’s wife). As both are viable and nothing in the stem forces one branch, the correct logical conclusion is that the data is insufficient to choose uniquely between “mother” and “aunty.”

Step-by-Step Solution:

Verification / Alternative check:
Check options: “mother” and “aunty” both appear, but selecting either would be speculative. The only logically safe choice is the meta-answer indicating insufficiency of data.

Why Other Options Are Wrong:

• grandmother / sister: Do not follow from the construction “wife of my grandfather’s son.”
• aunty or mother (alone): Either could be correct in a specific family, but the stem does not specify which son of the grandfather is referenced.

Common Pitfalls:

• Assuming the son must be the father—tests often include uncles in the same phrase.
• Ignoring that the puzzle expects recognition of ambiguous branching.

Final Answer:

Data inadequate