"Mehrling." . . "Twins." . . "Zwillinge." . . "Zwilling Psychologie." . . "Jumeaux Cas, Études de." . . "Zwilling Fallstudiensammlung." . . "Naissances multiples." . . . . "Case studies" . "Case studies"@en . . . . . . . . . . . "Biographies" . "Indivisible by two : lives of extraordinary twins" . "Indivisible by two : lives of extraordinary twins"@en . . "Indivisible by Two introduces us to an assortment of memorable characters, from the \"Fireman Twins\"--brothers who, though reared separately, are astonishingly similar in personality and behavioral traits--to the twin sisters who overcame one twin's infertility by having the other serve as her surrogate mother. We meet one of the few identical brother-sister pairs in the world after one of two sisters was surgically transformed into a man, and identical triplet brothers, only one of whom is gay while the others are straight. We see uniquely blended families--identical twin brothers marrying identical twin sisters, and Chinese twins adopted by different Canadian families yet raised as sisters. (Midwest)." . . . . . . . . . . . . . "Jumeaux Psychologie." . . "Twins psychology." . .