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It was clearly stated that Guzma's father tried to use force to stop him from "running away" but was beaten by Guzma himself as a result.
>I tried to set that boy of mine straight but when I did, I was the one who got beat....
>but when I did...
This was the very first time his father ever resorted to force. He never abused Guzma in the past as Guzma was proud and happy trainer that won many battle competitions (with the help of TM87, Swagger).
>One of the photos shows a tall boy clasping his island challenge amulet with the clear glow of pride
Guzma became the Guzma we know today because he was denied the title of trial captain, due to his desire to beat other people, rather than respect them in battles. Guzma worked for Lusamine because she was the only one in his entire life to acknowledge his strength.
>Muh golf clubs
The text was far too bleak to come up with an accurate conclusion.
TLDR: Guzma becoming the Guzma we know today has nothing to do with his family.