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They include the twin brothers who were raised separately , yet both became firefighters ; twin sisters who overcame one twin 's infertility by having the other serve as a surrogate mother ; the pair that started out as identical sisters , then one was surgically transformed into a man ; identical triplet brothers , one of whom is gay while the others are heterosexual ; identical brothers who married identical sisters ; Chinese twins adopted by different Canadian families yet raised as sisters ; twin survivors of Josef Mengele 's gruesome experiments in Auschwitz ; and twin brothers born in the 1930s to a Jewish father and a German gentile mother - one was raised as a Jew in Trinidad and the other as a Catholic who became a Hitler Youth member in Nazi Germany . An important element in the equation was the willingness of both Wirths and Mengele to give way rather than punish or kill her . Part of the Mengele style of selections performance was Nazi male macho : immaculately clean black SS uniform with riding boots and riding crop , exaggeratedly straight posture with reserved , dignified bearing , together with a slight military swagger and an aura of absolute authority over everyone . The siblings survived three years in the camp , where they were they were among the 3,000 twins experimented on by Josef Mengele and other Nazi doctors . This particular book interviews the son of Josef Mengele , who 's name is Rolf .