Name of horror movie?

I’m trying to remember this 2000s horror movie title to watch with my friends, i can only remember that the first scene is a woman making a videocall with her nephews and one of them asks ”who’s that behind you”. That woman eventually dies and i think her sister (?) goes to live in the house, then finds out some strange facts about their mother. The thing i can remember the most is that the final plot is that what she believed it was a spirit in the house it was actually an old man living under the house