I know a lady who does not talk to her mother, or allow her children to talk to her, or accept any gifts from the mother. She believes that if she does talk to the mother or accept any gifts that an evil spirit will come over her, and her children. She said that every time she would talk to her mother on the phone her children would get sick. Is there any scripture that supports the belief that a demon can come onto a person through materials, talking to someone, or entering various places (homes, graveyards, or whatever), and then make that person sick, injury them, or affect their mood? Or is this just superstition?