title: Twinning reaction in nontwin siblings.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007063:Identity Crisis; D008297:Male; D008426:Maternal Deprivation; D010287:Parent-Child Relations; D011247:Pregnancy; D011573:Psychoanalytic Interpretation; D012753:Shared Paranoid Disorder; D012801:Sibling Relations; D014427:Twins