Nick Reiner, 32-year-old son of Hollywood director Rob Reiner, has been arrested and charged with the double murder of his parents Rob and Michelle Reiner, who were found stabbed to death at their Los Angeles home. The younger Reiner, who has a documented history of drug problems and homelessness, is being held on $4 million bail. Rob Reiner was known for directing films including When Harry Met Sally, The Princess Bride, A Few Good Men, and Misery, and was politically active in Democratic causes.