Bill asked his brother’s wife’s mother-in-law’s only husband’s only daughter to join him and his wife for dinner. What relation is she to Bill?
2 Answers
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She is
his sister because his brother’s wife’s mother-in-law’s = his mother, her only husband is Bill's father, and so his only daughter must be his sister
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1$\begingroup$ This is probably the intended answer, although it assumes no children born out of wedlock, and also no previous marriages for the father. $\endgroup$– BassCommented Jan 30, 2019 at 17:43
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$\begingroup$ @Bass also Bill's brother could have married a widow, and her late husband's mother is still alive, while Bill's mother is not. $\endgroup$ Commented Jan 30, 2019 at 19:25
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$\begingroup$ @Bass & deepthought Right, I assumed it wasn't intended to be a tricky question $\endgroup$– yaaraCommented Jan 30, 2019 at 21:42
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She is Bill's sister.
Bill's brother's wife's mother in law = Bill's mother
Bill's mother's daughter = Bill's father's daughter = Bill's sister
Proved.
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$\begingroup$ This answer doesn't add anything to the answer given before. $\endgroup$– BassCommented Feb 1, 2019 at 8:44
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$\begingroup$ I was just explaining it more explicitly ;) $\endgroup$– 昨晚忘記呼吸Commented Feb 1, 2019 at 12:43
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$\begingroup$ If you want to do that, it's best to edit the existing answer. :) $\endgroup$ Commented Feb 2, 2019 at 16:13