The setting is very early 20th century America. It's a haunted house kind of story *sigh* but to avoid falling into the trap of crucifix-bearing priests or eccentric bohemian psychics, I decided that the family is too ashamed to reach out to the community for help, especially the church. See, the demon is one of the family members' "demons" manifested. So in a sense, she can control it technically, but the whole idea is that it eventually overtakes her and begins to torment the entire family. Does that mean they should be able to subdue it? But how? It would be super boring if they could just "go away, beast!" You know? Any help would be greatly appreciated!