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Seems impossible to me, for example what question would separate two identical twins( identical in dna and when born ).

And let's say you find such a question, there is no way that question would divide half of the population.

Well if you had conditional questions, you could ask who was born first.

That question doesn't even apply since you can only ask it to two twins, not a single person.

Going along with what someone said earlier, your last question can be "Were you born after someone who answered the previous 32 questions the same as you", which works to identify twins as well as people in general. Although I don't know how this would work for triplets (or any larger number of "twins" than 2); you'd have to make the previous 32 questions split them into groups of at most 2.

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