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Re:33 Questions by edsrzf on Sunday November 24, 2013 @03:27PM (#6790953)
Maybe something like "Do you have more older siblings than younger siblings?" would work. One twin has to be born before the other.

That question has some problems, but I feel like it could serve as the basis for a more specific question that would define how an only child or middle child would answer without introducing much bias. It would also have to define how half-siblings are counted and probably some other things.

Re:33 Questions by RogerL on Sunday November 24, 2013 @10:29PM (#6792340)
So you are going to burn one entire question that is entirely worthless for the vast majority of Chinese that have been born recently?
Re:33 Questions by Intermernet on Monday November 25, 2013 @06:11AM (#6793457)
Interesting read: "One Child Policy and Arising of Man-Made Twins". http://paa2013.princeton.edu/papers/130113
Re:33 Questions by pavel_lishin on Sunday November 24, 2013 @03:32PM (#6790983)
It's entirely possible that the twins would not know which one was born first.
Re:33 Questions by daleharvey on Sunday November 24, 2013 @07:39PM (#6791874)
Its entirely possible the person could not know the answer to any of the questions, I dont think that really counts