I can relate in several ways. One day I woke up to my step mom screaming and my dad screaming at her and the sound of things being thrown around. He was super drunk, and when he came out of his room, I pulled a knife on him, but he was too out of it to notice. That or he had and just never told me. Before I got it in me to move, he started crying, hugged me, and kept repeating "I'll get better" over and over again. After that day he started going to regular therapy. Religious therapy, not real therapy, but it never happened again, so I guess it worked either way. Nonetheless I can't bring myself to ever step foot in his house again. I've talked to him over messaging before during some emergency situations where I had nobody else I could call. He seems like he's really improved. But tbh, I don't think I'll ever be able to fully trust that he's genuinely changed. Because of him my stomach still drops whenever I hear sudden loud noises, even if it's just somebody dropping a screwdriver or something.