Frasier (1993) - 9x23 - The Guilt Trippers

As a birthday present, Niles surprises Daphne with a trip to Hawaii for two. However, Mrs. Moon falls into a state of total despair about her failed marriage, and Daphne feels bad about leaving her alone for the weekend. Niles hatches a plan to reunite Daphne's parents and get Mrs. Moon out of the apartment. He convinces a reluctant Daphne to take her mother on the trip, and secretly heads to England to track down Daphne's father. Niles hopes to at least convince Mr. Moon to come to the U.S. and give Daphne away at the wedding. He finds him at a bar, but Mr. Moon doesn't take too kindly to the idea of reconciling with his wife. Roz, depressed about her break-up with Roger, stays at the apartment to hang out with Frasier after Daphne's party. They end up sleeping together. Roz leaves in a panic the next morning, but promises that they will get together for dinner to talk things over. She promptly skips town and nixes plans for Frasier to join her at her family reunion in Wisconsin. Fearing that their friendship might be damaged beyond repair unless he takes immediate action, Frasier flies to Wisconsin anyway. The family mistakes him for Roger, and Roz is touched when Frasier plays along and helps her impress her family (which usually looks down on her). Roz and Frasier go outside to talk, and promise that they will always be close.