Children of the Vampire — Jeanne Kalogridis

MY SISTER
In the flickering gaslights of Vienna a brother watches--as a woman of alabaster beauty, his sister, takes two lovers at once. Then she pours her passion into the most forbidden act of all...

MY BROTHER
In the streets of Amsterdam a young man, the secret lover of his brother's wife, is whisked into a waiting carriage for a long journey into darkness and reunion with his father...

MY FAMILY
They are a family bound by an ancient curse, one generation pitted against another, taboos shattered, their firstborn's blood sipped from a silver chalice. In his stony fortress waits Vlad the Impaler, while his heir, Arkady, cries out to his sons: "Let the curse end with me!"