Is it true that is the movie morning glory based on a true story based on the following text?

The premise of the film was partially inspired by Neil Simon's The Sunshine Boys, where Harrison Ford's role was akin to Clark while Diane Keaton's role was akin to Lewis and Rachel McAdams' role was akin to Clark's nephew Ben. Screenwriter Aline Brosh McKenna and producer J.J. Abrams ''dreamed of having Harrison Ford in the film'' from the point of early script development. Shortly after Abrams cast Harrison Ford as Mike Pomeroy, Roger Michell took over as director.
no