10 Celebrity Couples Who Fell in Love After Playing Onscreen Siblings

Although Matthew Broderick and Jennifer Grey play warring siblings in the '80s classic Ferris Bueller's Day Off, the two of them clearly hit it off on set. Their romance fell apart, however, after they were involved in a fatal, head-on car crash while on vacation in Ireland in 1987, which claimed the life of the mother and daughter driving in the other vehicle.