What was the name of the episode in The Fresh Prince of Bel-Air when Vivian and Phil are fightingand everyone daydreams what it would be like if they were divorced?

The episode you're referring to is titled "The Way We Were," which is the 24th episode of Season 5. In this episode, Vivian and Phil's argument leads the family to daydream about what their lives would be like if the couple were divorced. Each character imagines different scenariOS, highlighting the impact of their parents' relationship on their lives.