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A man points to a woman and says, "Her mother is the wife of my father".
How is the woman related to the man?
Cousin
Daughter
Niece
Sibling
Sibling
Break the phrase into two parts: 'My father's wife' is the man's mother, and since the woman's mother is the man's mother, they must be siblings.
Break the phrase into two parts: 'My father's wife' is the man's mother, and since the woman's mother is the man's mother, they must be siblings.
Analyze the speaker's phrase
The speaker says 'My father's wife'. Since the wife of the man's father is the man's mother, the phrase simplifies to 'Her mother is my mother'.
Establish the relationship
If the woman's mother is the same person as the man's mother, then the woman and the man share the same parent, making them siblings.
A: Cousins share grandparents, not the same mother; B: A daughter would imply the mother is the speaker's wife, not mother; C: A niece would imply the mother is the speaker's sister.
D is correct because the phrase 'Her mother is the wife of my father' identifies the woman's mother as the man's mother, proving they are siblings.
When solving blood relations, always replace 'My father's wife' or 'My mother's husband' with the direct relationship (Mother/Father) to simplify the chain.