Blumenthal Arts is showing a production of “Immediate Family,” a play billed as “'Modern Family'” meets 'Guess Who’s Coming to Dinner.'” Led by the direction of two-time Tony Award winner Phylicia Rashad, noted for her role as Clair Huxtable on “The Cosby Show,” and written by Paul Oakley Stovall, a Tony Award-winning actor and playwright who also worked in the Obama White House.