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Percy' s cousin is a term used to define The children of Zeus And Hades (Greek Olympian Gods) And other Siblings of Poseidon.

Since Percy is a son of Poseidon then Nico Di Angels, Jason and Thalia Grace, Hazel Levesque are all cousins of Percy.
girl : Hey, I started reading "The last Olympian" if they're cousins, why are they dating?
Boy:Yea, Your...A...Very...Dumb...Person, Percy's Cousin Are the children of Poseidon's siblings, Duh
by Son_I_Saw_Your_B- April 09, 2015
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