Can an episode make you laugh 'till the tears ? Yes, of course. That's What a Butler Sang, the episode where Fran's sister (the cousin in the Italian version) Nadine (Nadia) is hosted by the Sheffields and she directly try to seduce Maxwell, upsetting Fran very much. Meanwhile C.C. and Maxwell organize a public audition in the house but just when Niles sang (badly, indeed),Fran, Nadine and her furious husband Barry start quarreling animatedly.
Niles' dreams (poor Niles! his dream was take part in a musical) still cruelly broken off, with C.C.'s satisfaction, the 70s ballet behind Niles singing, the C.C.'s pursuit with the chandelier, the scene at Maxwell's room, and many others.Genial humor-ism. Careless and devoid of any vulgarity.
It's strange that story writers never put Nadine, the sister (so a considerable member of the family), in any other episode. While Maxwell's sister, Jocelyn, appears in several episodes, she isn't always the same. The first was the famous model Twiggy, then replaced with Sophie Ward.