Demon Follows Family, Calls Wife's Name 'Janice' in Mother-in-Law's Voice

by Sara
(Indiana, USA)

Im looking for the name of a late 70's or early 80's film about a family that moves into a house that's possessed by a demon.

They plead with the Catholic Church to help them and it assaults the man. The husband's parents live with the family.

They move and the demon follows them. It calls for the wife Janice' in the mother in law's voice. TV crews are set up outside their home.