Final answer:
The most important intervention for the parents of an adopted preteen is to reassure their child that they understand the need to search for their identity.
Step-by-step explanation:
The most important intervention for the parents of an adopted preteen is to reassure their child that they understand the need to search for their identity. As adolescents work to form their identities, they tend to pull away from their parents and rely more on their peer group. However, it is crucial for the parents to show support and understanding during this process. This reassurance helps maintain a positive parent-child relationship and promotes the child's overall well-being.