My brother who tried to kill me is getting out of the psyche ward

I have an older brother who tried to murder me when I was 10. He was 13 and literally held a gun to my head... He was 14. He got into my mom's safe and took her gun and held it to my head taunting my mom that he was gonna kill me. My dad called the police and he dropped the gun and was sentenced to 10 years in a psychiatric hospital. My mom for reasons I never really knew up until last year hated my brother and treated him like a step child. My dad was never home. She didn't let me and my brother really form a relationship and would say we aren't real siblings. I watched her throw my brother down the stairs and spit on him. Ig he wanted to hurt her by killing me.... I'm still scarred from that day and remember him telling my mom how he's gonna kill her favorite child. I kind of found out last year after my mom died of why she treated him so differently. When I was getting stuff from her house I found my brothers birth certificate and it had my dad's name and another women's name. I took it home and for over a year tried to find this women. This is my brother is 24 now and my parents would have been married 32 years if they didn't divorce 5 years ago. So my bro was conceived during the marriage? Idk... I haven't asked my dad about it... My brother is coming to stay with him after he gets out.... My dad said he has to be there for both his kids which I understand. But I haven't seen him since he tried to kill me and idk where things will go from here.

@Gemini I get that she may not have been able to love my brother if he was conceived through an affair but I mean.... She could have just divorced my dad instead of abusing him to the point he wanted to kill me for revenge...

@Bri Yeah I don't think he knew my mom wasn't his mom either... Honestly I've never hated him. I was just scared of him for a long time. My dad visited him at the hospital. I did asked my dad what he thought of me and he did say he has no opinion of me and never wanted to hurt me... Just my mom in the worst way since she kept hurting him. At least that's what he said when he was 17. I don't hate my brother. I do feel for him. Idk how a relationship will work. We probably won't ever have a normal one but ig we will see