Broken family

You were adopted by a very rich family 12 years ago when you were six, you have 3 brothers, Ben, Orion, and Alaric who is blind. They have been treating you like a princess but then their so called real sister has come back, she has heart problems but she is secretly horrible to you, you are named Selene. Ever since their real sister has come back you brothers have been treating you differently and is always siding with her