TV sitcom ‘Extended Family’ taken from real-life relationship of Celtics owner, wife and her ex

When Boston Celtics owner Wyc Grousbeck felt like his life could be the premise for a television sitcom, he knew just where to turn: His friend Tom Werner, a Red Sox owner and TV veteran who was behind megahits like “The Cosby Show,” “Roseanne,” and “That ’70s Show.” The result is “Extended Family,” which premieres on NBC on Saturday night (8 p.m. ET, following the football) starring Jon Cryer (“Two and a Half Men”), Donald Faison (“Scrubs”) and Abigail Spencer (“Grey’s Anatomy,” “Suits”) in a love triangle based on the real-life dynamic that developed between Grousbeck, his new wife and her ex-husband — a lifelong Celtics fan.