Thanks to ranen for recommending this movie

[Source 2]

Plot:
The former orphan Laura raises her adopted son Simón with her husband Carlos in an old house and former orphanage where she was raised. Simón is HIV positive and tells Laura that he has five invisible friends, and she believes they are fruit of his imagination. Laura decides to reopen an orphanage for handicapped children in the location and during the opening party, Simón calls her to show the little cabin of his friend Tomás. The busy Laura does not gives much attention to her son; then she sees a mysterious masked boy and Simón vanishes. Laura feels the presence of other persons in the house and months later, the desperate Laura invites a team of parapsychologists to try to unravel the mystery.