Actually Apple, I agree with almost all the members of this board. Sonny would never have killed Fredo. He was too family oriented. Michael--you could see his ruthlessness right from the time they shot Vito. Nothing was gonna stop him from being on top and staying there. Even family. He would have had Kay killed too if she had tried to take his kids. He had no family loyalty. Only loyalty to himself. Even though he was a good don, his family wasn't his priority. (not including his kids, of course).