Born to be a vampire but I still have my humanity

This story will be about a vampire society where half-bloods (half human half vampire) are lead by nobles and nobles are lead by a lord and about a being who leads the entire vampire race including half-bloods but this story mostly tells you about the life of two half-blood twins. After their human mother dies not long after they're born, their father (a vampire) decides the best thing for them is to grow up in the human realm instead of the vampire realm so he puts them up for adoption and leaves them with billions of pounds for them to inherit when they turn 12 and leaves them. After they leave school they decide to find there father and travel to the vampire realm but they are in for a big surprise let alone the entire vampire race! (Ps. Humans don't know vampires exist except the humans who have offspring with a vampire).