Clay House by Jordan Elizabeth

When fifteen-year-old Tatiana Barrie and her family move to a small town in New York, the locals say their new home, known as Clay House, is haunted. Soon Tatiana’s little brother starts acting strange. He sees imaginary friends; he knows things he shouldn’t. Tatiana’s stepfather becomes abusive and erratic. Between possessed dolls and an unknown evil taking over her family, Tatiana is terrified more every day. She should be even more than afraid.