Data Sufficiency — Relationships: How is Tanya related to the man in the photograph? Statement I: The man in the photograph is the only son of Tanya's grandfather. Statement II: The man has no brothers or sisters, and his father is Tanya's grandfather. Decide which statements are sufficient to answer the question. Choose the correct sufficiency option.

Difficulty: Medium

Statement I alone is sufficient, but Statement II alone is not sufficient.
Statement II alone is sufficient, but Statement I alone is not sufficient.
Both statements I and II together are sufficient, but neither alone is sufficient.
Either statement I or statement II alone is sufficient.
Even both statements I and II together are not sufficient.

Correct Answer: Statement II alone is sufficient, but Statement I alone is not sufficient.

Explanation:

Interpretation

Statement I: The man is the only son of Tanya's grandfather, but the grandfather may also have daughters (e.g., Tanya's mother). Tanya could thus be the man's niece or daughter ⇒ ambiguous.
Statement II: The man has no siblings, and his father is Tanya's grandfather ⇒ the grandfather has exactly one child (this man). Therefore Tanya, being a grandchild of that grandfather, must be the man's daughter.

Final Answer
Statement II alone is sufficient, but Statement I alone is not sufficient.

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