TV sitcom 'Extended Family' inspired by real-life relationship of Celtics owner, wife and her ex

The new NBC sitcom “Extended Family” is loosely based on the real-life family dynamics between Boston Celtics owner Wyc Grousbeck, his wife and her ex-husband

BOSTON -- 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. EST, 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 inspired by the real-life dynamic that developed between Grousbeck, his new wife and her ex-husband — a lifelong Celtics fan.

“He looked at her like: ‘There’s a million guys in New England you could be dating,’” said Werner, who advised the three on developing the show and joined them as an executive producer. “What am I going to tell my friends?”

The ensuing hijinks play off the decision by Emilia Fazzalari and George Geyer to follow their divorce with an arrangement called nesting: Instead of making the children bounce around during custody swaps, the kids stay in the family apartment and the parents move in and out.

“The nest is someplace where Julia and I have tried to give our kids the false impression that nothing has changed,” Jim Kearney (Cryer) says in the pilot, which revolves around a true story in which Geyer was left in charge of his daughter’s goldfish “Googles” while she was at summer camp. The fish dies, they decide to replace it with a look-alike, and then wackiness ensues.