Need title a family of three finally escape a haunted house only to find they are themselves ghost

Could it be "The others"?

The Others (2001) - IMDb

Haunting of Winchester House (2009)
IMDb review excerpt (edited):
This is about a family of three (Mom, Dad and daughter) who are caretaking the Winchester House. It turns out that there's a curse on the house, and every person killed by a Winchester rifle comes to the house to get revenge on the family or anyone who's there, which equates to a lot of ghosts.

Haunting of Winchester House (Video 2009) - IMDb