How the hell you ain't here to see a prince do his thing
This line could also refer to his real father, or his step-father.
Hes stating how can a father not be there to witness his son become a successful artist.
His step father, who Wayne loved more than his actual father, died while Wayne was still young and before he had achieved success as an artist. Therefore he wasn’t able o witness his “prince” do his thing.
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