It begins (The Ocean's Twins)

A new prophecy. A new hero. A new tale. Andromeda, Percy's twin sister he knew nothing about, well the children of the big three have to stop the world from being destroyed as well as learn his dark past
Percy has not just out smart one prophecy but two, can he do it a third time. Or will he fail to save the sibling he always wanted... Andromeda lived a lie. Her parents are not who they seem and ever though she go what she wanted she was never loved. Percy never really got what he wanted but was loved. His mother never lied to him or so he thought. Perseus must save her from ultimate elimination. Follow the Ocean's twins as they fight for survival.

(Book is complete. There will be more in the series. I need time though :D )