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.
He’s wondering how his actual father can not be here to experience his son making a name for himself and “doing his thing”.
His step father, Rabbit, 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 to witness his “prince” do his thing.
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