I do not see creating a romantic relationship working for the daughter. The son maybe able to pull him out of trouble, but the mafia type is implied, the author could pull this one out as just a careful boss trying to maintain security at lower costs. Only trouble being the collections section, but still I haven't seen any serious leg breaking or permanent disposals. Could chalk it up to the imaginations of a naïve schoolboy that is easily tricked in gambling. The mother being older, ugly to a point, and a harpie ex wife. Well, she could manage the books for the mob types, and with potions, who knows if it is only effective female to male? The incest thing is only a problem if their is offspring, spiritual possession is not going to prevent physical close genetics though. I also find it strange that his son and daughter are younger than the daughter and apparent new mom of the possessed body.