Ain't Nobody's Business If I Do is the 11th episode of Season 5 on NBC series Frasier.


MARSHA MASON RETURNS -- Frasier (Kelsey Grammer) and Niles (David Hyde Pierce) are unnerved by the thought of Sherry (guest star Marsha Mason) becoming their stepmother after learning that Daphne (Jane Leeves) accidentally discovered an engagement ring in Martin's (John Mahoney) drawer. Realizing very little is known about her, Niles secretly hires a detective to research her past.


Kelsey Grammer as Frasier Crane
Jane Leeves as Daphne Moon
David Hyde Pierce as Niles Crane
Peri Gilpin as Roz Doyle
John Mahoney as Martin Crane

Special Guest Star

Marsha Mason as Sherry Dempsey


  • Martin breaks up with Sherry
  • Sherry's been married six times
  • Frasier and Martin share a nice moment, having a beer and watching a game at McGinty's