So sorry you are going through this right now. There's all sorts of actions that can be done about the safety of your brother, but it's whether you feel you showed come on in to this situation is what it all depends on. Sadly these awful things happen, and nothing can be done, or nobody knows, but if there is somebody, like yourself, out there that knows or suspects then I feel you have some sort of duty to say something, even if it is anonymous.

Please do something because imagine what pain you can spare him if you do. You have control over the next cycle......you can beat him from the other side without even seeing him. I think it would be worth it.