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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Nicki finally gets Frasier on CHEERS Season 3 Premiere "Rebound Parts 1&2" (1984) TV Reaction

After the breakup between Sam and Diane in the season-two finale, "I'll Be Seeing You", Sam has been drinking and womanizing ...