Legendary director Rob Reiner and his longtime wife have been found stabbed to death inside their Brentwood home and investigators are eyeing the couple’s troubled adult son as a person of interest, according to law enforcement sources. Officers were called to the home Sunday afternoon, where they discovered a man and woman with stab wounds, according to sources. The Los Angeles Fire Department told NBC Los Angeles that a 78-year-old man and a 68-year-old woman were found dead inside the home. Post sources confirmed the bodies discovered were the longtime couple, who married in 1989. The couple’s 32-year-old son and...