The twins of a water G-D

Just like her brother she has dyslexia but can read Greek somehow and she can hold her breath underwater for long time and she doesn't speak a lot. There's a reason or that. See their mother is mortal but their father is the G-D of the sea. But all her twin brother Percy knows is that he thinks their father left them. They really don't belong in this world they have powers but all magic comes with a price I fear. For one their mother remarried to this pig he has no respect for women and hates herself and her brother but the reason why is because of his horrid smell it keeps those that want to hurt them away from them other immortals like their father. They pretty much live their lives in the water and they can do things with water like their father but he doesn't know it and the only reason they have the problems they do is because of their powers those problems go away when they're in the half blood world with other demi-G-Ds like them in that world she's a mermaid, legs on land and tail in the water, and the not talking so much she has a beautiful voice, but its part of her powers her singing is like a siren song.