Pointing to a woman in a photograph, Tenzin told his friend, "She is the only daughter of the father of my sister's brother." How is the woman related to Tenzin?

MotherCorrect answerYour answerSisterCorrect answerYour answerCousinCorrect answerYour answerNieceCorrect answerYour answer

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CorrectNot quiteAnswer B

Correct answer: B

Tenzin is a boy, so his sister's brother is Tenzin himself (or another brother of theirs); either way, his father is Tenzin's father.
The only daughter of Tenzin's father is Tenzin's sister.

Worth noting

Mother is the wife of that father, not his daughter. Long chains like this often loop back to the speaker's own family.

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Explanation