I have only one brother.
My brother's wife name is Clara.
Clara has only one sister. Her name is Sara.
Sara's sister is also sister to me.
How?
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2$\begingroup$ Does 'brother'/'sister' exclude a potential half-brother/sister interpretation? $\endgroup$– RobStoneAug 20, 2016 at 4:52
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9 Answers
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Sara's sister is
a nun. She is genetically no sister for anyone else, still, she is called a sister by them.
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$\begingroup$ could you please explain how does this affect the relations? $\endgroup$– eliasAug 20, 2016 at 6:58
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1$\begingroup$ I think Mike is working off of the wording that "she is also a sister to me", being different from "is my sister". You call nuns sisters. You could also do the same with Mormon female missionaries. $\endgroup$ Aug 21, 2016 at 2:06
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It's possible if, for example:
Your brother and you have a father, Harry and a mother, Louise
Harry had a child with Jill called Tara (so Tara is your sister)
Jill had a child with Bob called Sara (so Tara is Sara's sister)
Bob had a child with Alice called Clara (Sara is Clara's sister)
Neither Bob nor Alice had any other daughters (Sara is Clara's only sister)
Your brother married Clara.
Like so (black lines parentage, blue line marriage):
answered Aug 20, 2016 at 2:02
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$\begingroup$ So, are you expecting a solution without "half-sisters" (or even easier, "step-sisters")? $\endgroup$ Aug 20, 2016 at 8:38
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Incest. Actually, the riddle says you only have one brother, but that doesn't rule out you having a sister, or multiple sisters. So you brother marries your sister Clara, and Clara's sister Sara is also your sister, because incest.
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You are male, and have a brother and two sisters. Your sisters are named Sara and Clara.
Now there are two possibilities. The one involving the least number of people is
Your brother married your sister Clara.
However the more likely situation is
Since nowhere it is said that both times Clara is mentioned, the same person is meant, your brother may have married another woman whose name is also Clara.
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If you have sisters Clara and Sara, and then your brother's wife name is also Sara it will work. The way you define it it's not clear if Clara from 'Clara has only one sister' is the same Clara as your brother's wife.
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I think
Sara is your wife!
so her sister is your sister, too.
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I can think like this.
There is a chance of having a second wife for the father. Sara may be the child of father and the second wife. Clara may have been there before father married her.
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Could it be:
You are Sara
I have only one brother
My brother's wife name is Clara.
Your brother is married to Clara
Clara has only one sister. Her name is Sara.
You are Clara's sister-in-law
Sara's sister is also sister to me.
Your sister is your own sister, of course
Or a slightly different interpretation
Your brother is your brother-in-law
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The simplest solution is
Clara is your sister in law. Clara married your brother. Clara has a sister named Sara. Sara has a sister named Clara. Clara is called your sister in law. Little back and forth, but it is pretty clear because of the exclusions.
