I won't take care of my autistic brother when my parents die, IIN?

As someone who is currently living with an autistic sibling I can say I relate to your feelings. I don't care if people think I'm selfish, I've been hospitalized because of my brothers violent outbreaks and he's destroying our house (I don't have a door or a wall because of his outbursts) I have a hard time keeping relationships because no one can put up with the constant screaming and violence, my dad commuter suicide because he couldn't deal with the stress, I have never been able to have friends over because I'm embarrassed, I've been diagnosed with depression because his needs always came first second and third so everything I have ever done has been an after thought, and I have PTSD from all the times I've been pushed down the steps, had speakers and televisions thrown at me (two of which have broken my feet), and have just been terrorized in general. I've lived with friends for months at a time to try and get some peaceful sleep for once. My mom thinks that when she dies I'm taking my brother and she is dead wrong. I've been begging her for years to put him in a home but her boyfriend keeps guilting her into keeping him here where he terrorizes all of us And our dogs day in and out. It's an awful life and it takes a toll on you.