Brother X and Y
“X” has a little brother called “Y”, but “X” is not an elder brother of “Y”. Why?
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“X” is an elder sister of “Y”.
“X” has a little brother called “Y”, but “X” is not an elder brother of “Y”. Why?
“X” is an elder sister of “Y”.
Noemi and Rose were born on the same day of the same year of the same father and the same mother. They look almost exactly alike, yet they are not twins. Why?
Noemi and Rose are two members of a set of triplets.