confront him directly. if he ever has kids in the future threaten that you will arrange for the same thing he did to you to be done to them if he doesnt break down in apology in front of your face
pay some yobs to beat him out the blue.
thing is you need to see him break down. you need to see his weak side.
alternatively you can forgive and forget and see yourself as a separate thing from all that has happened to you. separate the act and your worth. you want acknowledgement, payback and to blow off steam the above suggestions are the best thing. alternatively arrange to have his closest friends know. keep your family out of it.. devise a lie... fake an old diary entry.. bring up some ex schoolmate you can use as a fake witness.. act it all out in front of the family. see how brother will look. if you can get an ex primary school mate who is a woman (with a brother) to help you act the scenario out in your family living room, it would be gold.
there are many things you can do. depends on what you want and how committed you are.
i suggest watching this video too