Evil (step?)father, falls off a cliff with his vehicle in the last scene

I have seen the film in 2002 or 2003 and remember very little:

  • the genre was “thriller”
  • there was a mother with one or two children
  • the father or stepfather of the children was an evil man (likely a severe abuser, but I don’t remember the details)
  • at the very end, he rides off the cliff with his vehicle, like the truck driver in Duel (1971)

Thank You in advance

The Glass House (2001)?