Dr. Yousuf N. Ahmad, MD

Yes, you can be helped. The aim is 100 percent remission of symptoms. You have described 2 symptoms of major depression, poor concentration, and anhedonia, or lack of interest in everyday activities.
You need to see a counselor who will assess the extent of your depressive symptoms through assessment.
Simple stress related depression due to overwhelming academic issues or social stress is treated by CBT, where a therapist points out faulty negative thinking when depressed, and establishes realistic thinking, these are called cognitive distortions.
Severe depression needs medication Management typically done by your PCP or a psychiatrist in combination with therapy.
The majority achieve remission.

Depending on his personality traits, which are inherited, he may be very sensitive and hold in his feelings, likely causing him to feel depressed and overwhelmed with feelings. Try to understand the way he feels, not the way you want him to behave. It takes time, therapy helps.

Try to engage her to find out what's happening with peers in school, peer relationships are important in this age group, with internalizing of feelings and support from dark music and writings. If it's transient and she is functioning well in school and has a supportive family, that helps quite a bit. Whoever she is close to at home or in school can engage her. Also room checks for sharps etc is important. Let her know she is supported. If there are persistent depressive symptoms, an evaluation by a counselor is necessary

Yoga is great for relieving stress as part of an overall program, and for achieving a sense of calm in his mind. If there is limited attention, he may not be able to practice yoga straight away. Try and figure out why he can't concentrate, usual reasons are excessive work, poor sleep and study habits and school stressors. Yoga would be a useful adjunct as part of an overall assessment

If she's acting like a 2 year old in terms of hyperactivity, school must be aware and provided you with information. It's highly unlikely that a 14 year old very hyperactive kid who behaves like a 2 year old would not be assessed by this age. Common causes are ADHD, and learning disability, in addition to many others

Have a discussion focused on seeing limits to phone use. Try and set aside family time where face to face contact with family is encouraged, and study time without the phone. Use positive reinforcement as well way to get her get phone time, rather than negative reinforcement, like punishment etc.,Which only disturbs family relationships. All this of course must be gradual and there are always bumps in the road