In the episode my fair Ester on Sanford and son what song did Fred ester sing together?

The episode you're likely thinking of is called "My Fair Esther," but there is no song that Fred and Esther sing together. In the episode, Fred attempts to teach Esther proper etiquette and social graces, which leads to some hilarious situations. The episode focuses on their interactions and humorous misunderstandings, not on singing.

It's possible you're thinking of another episode or a different show altogether. Could you give me more details about the song or the episode?