My sister is a demon? While I'm....... but how?

Regin Angelngeliu's finds out that her sister, Lithith is a demon! But before she knows she meets a hot guy who is a vamp. and she works with him...(if you want to know why he's "important" then read! plz :D She is out looking for a job in Mexico so she can afford enough money to go to the United States. She leaves her mother and other adopted brothers and sisters behind. Her mother told her and her sister lies that they are all sisters and brothers and that "some" are adopted, but she then finds out that her and her sister are in danger. Who tells her? Who helps her? Will she live? IDK, but maybe you will :P