Central Perk - The Friends Wiki
The One With The Inappropriate Sister
Season 5, Episode 10
Air date 17 December 1998
Written by Shana Goldberg-Meehan
Directed by Dana DeValley Piazza
Episode guide
The One With Ross's Sandwich
The One With All The Resolutions

Phoebe volunteers to help collect money for the poor during Christmas time. Ross, with nothing to do while he's on indefinite leave from work, helps Joey write a screenplay. However, his constant pushing of Joey sparks up an argument with Chandler. Rachel starts dating Danny, but is put off by his very close relationship with his sister.