I’m looking for a ghost movie where the main characters are actually the ghosts?

So i saw this movie in the middle of the night on cable when I was like 12-13. The movie was this really long ghost movie, but it was a mom and her children, the dad went off to war, and her son was deadly allergic to the sun, so she kept freaking out about the curtains opening and terrified and semi in denial about being haunted. The twist ending is the she and her children were the ghosts haunting the house, and the people who lived there kept opening the curtains.