So essentially, your father broke your younger brother. Did that younger brother seek your fathers love by trying to copy him, or was he just so broken by it, he had to take it out on others? It appears two out of three escaped that gripe of dysfunction. It must have been hard though, to witness that.My father was an emotional bully and a control freak so I copped it at home as much as I did at school. My sister and I were both just too strong willed and obstinate and he never had any real control over us. He hated both of us but our younger brother turned in to a carbon copy of him. So yes, I've seen what you're talking about first hand.
The real problem though is that many people don't "see" bullying, all they see is what they understand as the regular assertion of a pecking order. To many people this is their understanding of how the world should work. They even quantify it using terms like Alpha Male.
Not every abused (mentally or physically) child turns out to be that, in fact many have a power in them to rise above it. You did, so you know that personally.