Brother Unknown

After her grandmother's death, Katie isolates herself-until she finds Mark, a charming half-brother who offers the family she's been missing. But soon, Katie's instincts tell her something is wrong.

Brother Unknown is a 2026 drama thriller movie, starring Hal Dion, Olivia Rand, Payton Ash. It holds an IMDb rating of 5.8/10 from 27 votes and runs 1h 35m.