The Forgotten (2004)

Telly Paretta's son Sam dies in a plane crash. The movie takes place 14 months after this has happened. Telly is having grief counselling, but suddenly, her psychologist tells her that Sam was just a figment of her imagination. She tries to prove that he existed but all photos and videos of him are gone. She meets Ash Correll, who had a daughter who died in the same plane crash. He can't remember his daughter, Lauren. Telly goes into his office and rips back the wallpaper revealing Lauren's room. Telly manages to remind Ash about Lauren and then they realise that their kids aren't dead. They find out that aliens are conducting an experiment on them to find out about mother-child bonding and whether it is possible for a parent to forget a child. Ash and Telly go on a quest to find their kids, and, along the way, Telly finds out that her husband has forgotten her.