As it turns out this episode is a great example of character development. Monica insists that Ross tell the truth. Ross, when he was in college, got high and blamed it on Chandler. This is why his parents don't like Chandler.
This enlightenment is caused by a Ross, Monica- telling their parents their secrets in trumping fashion. Their parents learn A LOT about their kid's secrets and the truth about Ross' high.
Rachel makes a disgusting trifle and the group eats it, so she doesn't feel bad. This produces hilarious bloopers on the season dvd.
This episode features a lot of truth telling and because of the brother/sister tattle-tale is one of my favorites!!