Marlo Thomas and Steve Guttenberg talk about their roles in “Relatively Speaking,” three one-act comedies by the writing trio of Ethan Coen, Elaine May and Woody Allen, directed by John Turturro. Each comedy springs from a different branch of the family tree. In "Talking Cure," Ethan Coen uncovers the sort of insanity that can come only from family. In "George is Dead," Elaine May explores the hilarity of death. And in "Honeymoon Motel," Woody Allen invites you to the sort of wedding day you won’t forget. “Relatively Speaking is playing at the Brooks Atkinson Theatre.