Examined family- and sibling-type differences in sibling relationship quality and links between sibling relationship quality and child behavior problems among 192 families with a 5-year-old target child and an older sibling. Found that sibling negativity was highest in single-mother families. Found that full-siblings were more negative than half-…

Examined influences on children's behavior problems in households defined by marital status and sibling relatedness. Found that genetic influences accounted for 81 to 94 percent of mean-level difference in behavior problems between two-parent/full sibling, and the mother-only/half sibling groups. Shared environmental influences accounted for 67 to…

One goal of a longitudinal study of stepfamilies, divorced maternal custody families, and nondivorced families was to assess the quality and functioning of the sibling relationship and to determine the conditions under which sibling relationships become more cohesive or more competitive during family transitions. Relationships between the target…

This study compared the development of 38 infants from separated or divorced families with that of 38 infants from married families in Britain to determine whether parental divorce or separation precipitates cognitive, social, or emotional difficulties in infants. Infants were 11 to 45 months old. Infant-mother attachment was measured using the…