i read this on the website:

This may seem like a very strong statement, but it is based on 8 years of direct work with suicidal and self-harming teens. In our experience, there has never been even one case where a teen who was suicidal lived in an emotionally safe home. If it were an emotionally safe and supportive home, they would not be suicidal. This may sound simplistic, but we believe this is a true statement. It is like saying if someone is physically starving, it is clear they have not gotten enough to eat. So the first priority is to provide them with food. But in this case it is emotional support and safety. Again, this is based on 8 years of helping suicidal teenagers.

Once the teen gets away from the parents, they can start to see that what happened to them was not healthy. It might have been "normal", but it was not normal in healthy homes.

If the parents are willing and cooperative, provide them with emotional skills training. Whether the teen is returned needs to depend on the parent's willingness to change, not the teens ability to adapt, change or cope.