Название книги: Creatures of the night

At first sight, a usual family consisting of two vampires. Brother and sister love each other very much, try not to leave for a long time and avoid society of other vampires. But quiet, imperceptible life suddenly comes to an end. The former friends and enemies unexpectedly remind the existence of the released family. Besides, the main character makes such acts which attract a lot of problems. The history of two vampires begins with one of them.