I was watching this movie where this mother has a son and one day she wakes up and he is no longer in the family photos. Her husband states that the son never existed and nobdoy remembers him but her. She knows that her neighbor has a daughter as well and when she goes over there, the daughter is not there and the father does not remember her. In one scene.. the mother is ripping down the wallpaper in her neighbors house where the daughters room used to be. Underneith is the daughters wallpaper and then the father starts to remember. I think it might have been something to do with the government? PLEASE Help me with this movie title..

It's The Forgotten (2004) (http://www.imdb.com/title/tt0356618/)

Thank you so much!