If by Fredo, you mean Fredo Corleone I think he is a believable character.
He has many characteristics that are needed in a novel. For a start, he was treated as the baby of the family because of a out of pneumonia as a child and he is considered weaker and less intelligent than his siblings.
He is also considered the black sheep of the family as he loves being part of the Corlene family and what it comes with it ( money and women) but he doesn't like the responsabilities that come with the name.
He craves respect but he doesn't earn it as his siblings and father are continously covering for his mistakes.
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Getting off a topic a lot with trying to explain your details and evidence will prevent you from being able to get back on track with your main reasons and keep your readers attention on what you are trying to talk about.
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i dont know ... i totally forgot .
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