Hmmm...never saw a film like that with that title. The only one I know of that's contemporary is John Russo's "Midnight," and that's sort of "Deliverance with Satanists" in theme.
The film you're describing sounds like "Mother's Day" (1980):
http://www.imdb.com/title/tt0081186/
A lot of people think "Mother's Day" is fairly clever for a cheap film. I thought it was watchable...