Step by Step on ABC

Question: Here's the clue: Frank and Carol on Friday night. With his and hers and a nephew not bright. Can you tell me the show? Thanks.

Answer: I see your poem:

So now it's rhyme with which you seek
To leave me flummoxed, vexed and weak?

And raise you a haiku:

(Oh, yeah — Patrick and Suzanne's show ran on ABC from September 1991 to July 1998 and the dim nephew, Cody, was played by Sasha Mitchell. You can only fit so much info into poetry, y'know.)