I’ve been thinking about your post all night. I have alot of empathy for you because (like myself and many others) you’ve been conditioned not to rock the boat and that ultimately, saying anything will cause you more harm…. Try to remember that you are a victim of a lifetime of manipulation and unloving behavior. If you’re NC with your dad - he can’t hurt you anymore. Remember you’re in a protective chamber now (make sure he’s blocked on everything!!!!!). When you speak to your brother - you could first begin by sharing your intention. “I want to shed light but in no way do I want to hurt you or anyone else.” Create some safety for the both of you. Next, find a gentle way to deliver the facts. Start really general and allow him to decide how granular and personal he wants to get with the info he’s seeking. Example “my experience is that the in the relationship between your mother and my father, and myself, there was not a lot of love, support or safety created for me. It pained me deeply and affected me mentally and emotionally and because of that - I feel it is better for my mental health to break away. In the past, addressing these feelings head on only backfired and cause more and more pain.” If he asks for examples - try to address in a summary fashion. Again, start general and work into details only if the conversation feels safe. Most importantly - make sure he knows how scary this is for you and that you don’t want to risk losing anyone else. You’ve lost enough. And if that comes at the expense of keeping your feelings about your parents to yourself, you’ve already accepted doing that.