Lasher by Anne Rice

The Mayfair family struggle against a manipulative, non-human entity seeking to engineer its own permanent physical rebirth through their bloodline. They attempt to uncover the creature's history and stop its destructive efforts to propagate a new, superior species. 

This book contains: abortion (referenced), alcohol/abuse, alternate gender/sexual ideologies, animal cruelty, body horror, dark content, death/grief, deception, demonic content, depression, derogatory terms, divination, dubious consent, erotica, explicit sexual activities/nudity, fetishes, gore, incest, kinks, miscarriages, murder, patently offensive content, pedophilia, pervasively vulgar content prescription drugs misuse,  profanity, prostitution, prurient content, rape, self-harm, smoking, stalking,  suicide, theft, toxic relationships, violence and voyeurism .