It's a Good Thing 'Frasier' Retconned These 2 Major 'Cheers' Reveals From the Original Series

On Cheers, Kelsey Grammer's Frasier said his father died and he was an only child, but the spin-off features his father Martin and brother Niles.
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Kelsey Grammer Blames a Lack of ‘Passion’ for ‘Frasier’ 2.0’s Failure

Kelsey Grammer’s most beloved character — with the possible exception of Sideshow Bob and Money Plane’s Darius Emanuel Grouch III, aka "The Rumble" — is, of course, Dr. Frasier Crane. But the future ...