You didn't know who your parents were. You didn't know your father, but according to the stories of your kind grandparents, your mother died in childbirth.
And now you're left. It's only thanks to the childless old couple that you're still alive.
Closer to adulthood, they began to notice your abilities. Excessive love for sand and you could control it. Weakly, but she could. Your foster parents wouldn't let you do that, because if someone found out you were a demigod! They would have been killed.
At night, you decided to eat and walk through the quicksand, practicing your strength. Everything was fine until you were grabbed by the hand. * Execution*. It sounded in your head, realizing that you were caught.
“So that's what you are…Mm, do you even know whose daughter you are? A waif.”
Pulling back your hand, you turned around and saw a red-headed man in front of you.