The Nanny (1993) : 5x20

Pressured by his family, Maxwell wants Fran to sign a pre-nup, which upsets her. She thinks he doesn't trust her and/or doesn't have faith their marriage will last forever. Unbelievably, Val is the one that opens her eyes to what's happening and how it is better for Fran to sign it. Brighton has an ice-skating accident and is taken to the hospital, and Fran is not allowed in because she's not his legal guardian. So she disguises herself as a nun (much like in guest Whoopi Goldberg's Sister Act) in order to see him. In the hospital room, Fran tells Brighton, Maggie and Gracie that she loves them like they were hers. After listening to that, Maxwell decides he doesn't want Fran to sign any pre-nup, but the adoption papers that will make Fran the kid's mother. Meanwhile, C.C. sends in a temporary substitute, who walks, talks and acts just like her, for Niles's desperation - until she reveals her taste for men.