Final answer:
The statement that differential parenting did not result in nonshared environmental influences is false because differential parenting can lead to individual differences among siblings in the same family.
Step-by-step explanation:
The statement 'Differential parenting did not result in nonshared environmental influences, meaning that the adolescents experienced the same family environments.' is false. Differential parenting refers to the different ways in which parents may treat their children, leading to nonshared environmental influences that contribute to the individual differences seen in siblings, even those raised in the same household. These differences in parental treatment can be in terms of warmth, discipline, expectations, or attention, among other factors. This means that adolescents may have different experiences and perceptions of their family environments, even when they are raised by the same parents.