When do you kick them out? And how do I do it?

[Parents! Get help here!]

I have not been here in ages. Thought d would get her DbT and get better.
Two nights ago brother called her stupid and now she feels traumatized and abused. She went wild and took a knife and her dad wrestled it away from her . Her brother and sister took a video. She has in the past tried to strangle me and stab me. Brother took control physically when she tried to hurt me and she says that was abusive and now both kids want to go to lawyers to ‘tell on each other’. I wonder if she has been abusing me and I would try to calm the situations down . Never worked as you know. She said if I don’t tell the lawyer that she did not try to hurt me and that her brother was abusive  she will come to my place of work and commit suicide.
I have a call to a lawyer. Her brother is 19 and her other sister is 15. How do I navigate this? I want her out . She is in university part time and doing well. Cannot hold down a job as traumatic don’t you know. I can support her until age 25.
Please tell me how you do this .
Thank you so much. I am so lost.

[please]

I have not been here in ages. Thought d would get her DbT and get better.
Two nights ago brother called her stupid and now she feels traumatized and abused. She went wild and took a knife and her dad wrestled it away from her . Her brother and sister took a video. She has in the past tried to strangle me and stab me. Brother took control physically when she tried to hurt me and she says that was abusive and now both kids want to go to lawyers to ‘tell on each other’. I wonder if she has been abusing me and I would try to calm the situations down . Never worked as you know. She said if I don’t tell the lawyer that she did not try to hurt me and that her brother was abusive  she will come to my place of work and commit suicide.
I have a call to a lawyer. Her brother is 19 and her other sister is 15. How do I navigate this? I want her out . She is in university part time and doing well. Cannot hold down a job as traumatic don’t you know. I can support her until age 25.
Please tell me how you do this .
Thank you so much. I am so lost.

Our objective is to better understand the struggles our child faces and to learn the skills to improve our relationship and provide a supportive environment and also improve on our own emotional responses, attitudes and effectiveness as a family leaders

[please]

Sorry she is 22