Triton is the son of Poseidon who's brother of Zeus who's the father of heracles making

Thanks for the title,as always.
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For my sanity, I'm going to reword it for charity: Zeus and Posiden are brothers. So Triton (Posiden's kid) and Hercules (Zeus' kid) are cousins.
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To go a step further, Ariel is Triton's kid and, therefore, Hercules' second cousin.
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Edit: spelling