Communication is the key
Then communication is particularly important at this time. Explain the truth to the child, where is his fault, why his request is unreasonable, and why his parents will not agree to his request.
Deepen parent-child relationship
At ordinary times, we should pay more attention to her, and don't let her feel that she is getting farther and farther away from her parents, so as to educate her children and spend her adolescence smoothly.