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Pointing to a woman, Madan said, "Her son is my fatherтАЩs only grandson".
How is the woman related to Madan?
Sister of Madan
Aunt of Madan
Wife of Madan
Grandmother of Madan
Wife of Madan
Break the phrase 'my father's only grandson' into 'my (Madan's) son'. If the woman's son is Madan's son, the woman must be the mother of the son, i.e., Madan's wife.
Break the phrase 'my father's only grandson' into 'my (Madan's) son'. If the woman's son is Madan's son, the woman must be the mother of the son, i.e., Madan's wife.
Analyze the phrase 'my father's only grandson'
Madan's father's only grandson is Madan's son (assuming Madan has no siblings, which is implied by 'only' grandson in standard relation puzzles).
Map the relationship
The woman's son = Madan's son. Therefore, the woman must be the mother of Madan's son.
Conclude the relation
Since the woman is the mother of Madan's son, she is the wife of Madan.
A: Sister of Madan would imply the son is Madan's nephew, not his own son. B: Aunt of Madan would make the son a cousin, not his son. D: Grandmother of Madan would mean the son is Madan's uncle or father, which contradicts the generation gap.
C is correct because the phrase 'my father's only grandson' refers to Madan's own son, making the woman, who is the mother of that son, Madan's wife.
In pointing-based blood relations, always start from 'my' or 'I'. If it says 'only' grandson/son, ignore other potential siblings in your mental model.