The | Light

The family members are emotionally estranged, living parallel lives until the arrival of Farrah, who uses a rhythmic, flickering lighting device to help process trauma.

Since there are several prominent works with this title, here are detailed reviews for the most likely matches in film, literature, and gaming: The Light

A psychological first-person game developed by Sergey Noskov that emphasizes atmosphere and philosophy over action. The family members are emotionally estranged