This movie was about a woman that returns home after being sent a way as a child. The home was part of an old mill and her parents were killed there when she was young. Her sister is a monster living in the mill and I think killed the parents. The movie opens with she and husband driving back to the mill and some guys were pulling a fella with a car (kind of skiing like) and he goes through a barb wire fence. Think is was late 60s or early 70s.

The Shuttered Room (1967)
Starring Carol Lynley, Gig Young, Oliver Reed
IMDb synopsis:
In a small island off the American coast, the Whateleys live in an old mill where a mysterious being creates an atmosphere of horror. After her parents get killed by lightning, young Susannah is sent to New York by her AAunt Agatha, who wants her to avoid the family curse. Years later, Susannah, now married, persuades her husband to spend a holiday at her homeplace. Once on the island, Susannah and Mike find themselves exposed to the hostility of a gang of thugs.

The Shuttered Room (1967) - IMDb (http://www.imdb.com/title/tt0062266/?ref_=fn_al_tt_1)