The episode "Momma Mia" when Frasier last but not least realises that his girlfriend is similar to his late mom, and Niles thinks that he's suffering from an Oedipus advanced. Frasier, you failed to do anything completely wrong, your feelings for Mia stem from flawlessly purely natural Oedipal desires. Frasier: Yes, but Oedipal wishes are intended to resolve themselves by the age of 6!