Proper parental care and attention is needed. First parent training is needed to manage the new Gen kids. Not to be too lenient or too stringent is a tough task.
Next Steps
Both parents first See a therapist and learn strategies.
Health Tips
These behaviours may lead to more harmful issues if not addressed right now. But parent training is required as teenagers keep blaming parents. The only way is change in parenting style and then working with the teen.