Reviews findings of two large adoption studies. Both examined the levels of intellectual and personality development, as well as the degree of resemblance, among family members. Focus is directed toward intelligence quotient and school achievement tests, with briefer attention given to personality interests and attitudes. (Author/RH)

Used a longitudinal sibling research design and a large, nationally representative sample of 15- to 22-year-old siblings to study shared and unshared environmental influences on delinquency. Although no unshared family environmental influences were found for sisters and mixed-sex siblings, they may have existed for brothers. Data suggested…

Developed a model of individuation in family relationships focused on communicative processes. Expressions of four dimensions of the model (self-esteem, separateness, permeability, and mutuality) were predicted to be positively associated with identity exploration in adolescents. Analysis of observations of families in a Family Interaction Task…