In a 2006 study published in the Journal of Neurogenetics, psychologists at Baycrest Hospital in Toronto recruited families composed of an adult brother and sister and their biological parents.

• 2006年发表在JournalofNeurogenetics的一份研究中，多伦多贝加斯医院的心理学家招募了一个由姐弟俩和他们的亲生父母组成的家庭。