The One With Phoebe's Birthday Dinner: Birthday episodes on Friends are usually a time for flashbacks but this one is all new. Ross and Rachel have to leave the baby for the first time, Monica and Chandler want to make a baby (without the post-coital cigarette) and Joey is the only one who turns up on time. The One With The Male Nanny: Freddie Prinze Jr. makes a special guest appearance as guess who...the male nanny. Rachel loves him but Ross is not convinced. Joey learns a lot. The One With Ross' Inappropiate Song: When taking care of Emma Ross discovers that she smiles when ever he sings a certain song, but when Rachel finds out she thinks it's inapropriate...until she sings it and the baby laughs. The One With Rachel's Other Sister: Christina Applegate guest stars as Rachel's other sister who comes to spend Thanksgiving with the friends because her boyfriend has to be with his wife. Friendship and family are brought in question when they all wonder who gets Emma if Ross AND Rachel die?