Links between positive and negative aspects of the parent-child relationship and child adjustment are undisputed. Scholars recognize the importance of parental differential treatment (PDT) of siblings, yet, less is known about PDT in the context of the shared (family-wide) parent-child relationship climate, or about the extent to which positivity…

Many topics of interest to developmental scientists are informed by behavioural genetic findings and their implications. First, behavioural genetic theory and methods will be briefly outlined. Next, findings will be illustrated by considering two disparate areas--general cognitive ability (IQ), and children's self-conceptions. These topics have…

Using a sibling design, this study examined the association between adolescents' friendship experiences and their aspirations for self-acceptance, affiliation, and financial success. We hypothesized that adolescent siblings would differ in their aspirations and that unique experiences in friendships would be associated with these differences.…

Background: The identification of specific nonshared environments responsible for the variance in behaviour problems is a key challenge. Methods: Nonshared environmental influences on teacher-reported behaviour problems were explored independently of genetics using the monozygotic (MZ) twin differences design. Six aspects of classroom environment…

Background: Relationships within families are interdependent and related to distal environmental factors. Low socioeconomic status (SES) and high household chaos (distal factors) have been linked to less positive marital and parent-child relationships, but have not yet been examined with regard to young children's sibling relationships. The…

The current study examined whether parental and contextual risk factors contribute to mothers' and fathers' differential treatment (MDT/FDT) when accounting for sibling dyad characteristics. Also explored was whether family type (single mothers vs. 2 parents) moderated the links between the parental and contextual correlates and MDT. One hundred…

Background: The study aimed to confirm previous findings showing links between household chaos and parenting in addition to examining whether household chaos was predictive of children's behaviour over and above parenting. In addition, we investigated whether household chaos acts as a moderator between parenting and children's behaviour. Method:…

Using a longitudinal, large-scale sample of British twins, we addressed the prediction of both cognitive abilities and behavioral adjustment from eight domains of environmental risk: minority status, socio-economic status, maternal medical factors, twin medical factors, maternal depression, chaos within the home environment, and parental feelings…

For 720 same-sex sibling pairs from 10 to 18 years of age, parents and adolescents provided information about family environment and adolescent adjustment. Found that adolescents' perceptions of their parents' conflict-negativity mediated the relationship between parental conflict-negativity and adolescent antisocial behavior. (BC)

The current study examined whether socioeconomic status (SES) and chaos in the home mediate the shared environmental variance associated with cognitive functioning simultaneously estimating genetic influences in a twin design. Verbal and nonverbal cognitive development were assessed at 3 and 4 years for identical and same-sex fraternal twin pairs…

The psychological adjustment of ethnic minority children has received little research attention, particularly in Britain. The present study set out to investigate the adjustment of Indian children living in Britain as well as the adjustment of their English peers. The sample consisted of 125 children (66 Indian and 59 English) between the ages of…

Examines the extent to which substantial differences in the attitudes of children from the same family are mediated by nonshared environmental processes or by genetic factors. Results suggested that parental and sibling negativity is significantly related to adolescent adjustment through nonshared environmental processes, although genetic factors…

Examined nonshared environmental (NSE) influences on twin preschoolers' behavior independent of genetics. Found that within-pair parenting differences correlated with monozygotic differences in behavior. For the extreme 10 percent of the parenting-discordant and behavior-discordant distributions, average NSE effect size was 11 percent, suggesting…