Frasier Crane's family tree is quite simple, but it has expanded in the last couple of decades with the addition of some notable characters. NBC took a massive risk in expanding the Cheers universe when it decided to greenlight Kelsey Grammer's spin-off. For starters, the polls strongly suggested that the public essentially had no interest in watching a show that was fully focused on the snobby psychiatrist. By then, the network already knew that just because a new series was tied to Cheers, it wasn't a guaranteed success as seen with The Tortellis. Despite that, creators David Angell, Peter Casey, and David Lee still moved forward with the project.