My Abuser Will Kill Me If He's Out Of Jail

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Dont know how to acc change the location but my location is Canada: Manitoba

Hi, everyone, this is an incredibly tricky situation. I am 17F, my father has been an abuser my whole life. Basically, yesterday he was beating my mom incredibly hard, I heard her scream and after years had the courage to call 911. But now my mom wants him to return home on the promise he will take therapy. I have video recording of her saying shes willing to lie to get him out. I have a picture of her leg, her injuries are horrendous. I am begging, anyone who knows how to make him serve life sentences tell me what to do.

Thing about him is that he is mentally unwell and unstable. If he goes to jail and comes out he will hunt us down and kill us and then himself. If he comes home on the promise of 'therapy' he will kill us. If hes in jail he needs to be there until he rots. What worse is that he knows how to talk to people. He will probably be let out on good behavior. What can I do so he never gets out? How do I make sure hes behind bars and doesnt ever make it out as long as he's alive? I have horrendous stories of him hurting me, my sisters and my mother. I don't have much proof but I have photos of now and my younger sister has some photos too. I am soon 18, if my mother doesnt testify against him I will. Please tell me anything you all know how to keep him in jail for life. He CANNOT get out he will hunt us down. If he's going to jail he must stay there until he rots, if he comes home right now on some good behavior bullshit... I don't mean to say this but I won't be alive wether by his hands or my own. My whole life I lived in constant fear of coming home from school, of doing anything wrong. He has a list to go off of checking what he can get mad at. He fully believes hes in the right, what hes doing. My mom thinks its 'safer' for him to come home on the promise of him starting therapy but she doesnt understand that next time he does this, he will make sure nobody can even call 911 because we wont even be alive. Please tell me everything possible.