Dear Kittyclaws,
You have brought to light the awful things done to you. IMO you are very brave especially knowing your brother got off scott free.
I could beg you to not let this torment you but I'm not in your shoes. I will beg you not to hate yourself, what you did was the right thing. No matter how old or sickly he is doesn't excuse what he did to you.

I am so sorry this has torn your family apart but their denial or choice of how/who they believe is not your fault, none of this is. You were a child.
Maybe with your brother at least being accused & now the thing facing charges, the courts will see there is a connection/pattern. Either way please try and be kind to yourself. May be rambling here, just wanted to respond.
Many prayers coming your way.