remember when the tribal chief was introducing people and he went "this is my bro... my sis... my uncle... and my cousin vinny"

Yes the name of the episode is Jungle Love, Chris gets married and peter shows up and is rich by the cultures standards. Peter ends up corrupting some islanders and in general it was a funny episode...most of them are.

Chris: Dad, don't you see? You're using the island to get out of your problems at home.
Peter: What are you talking about? Meg's right there

I saw that. that show is hillarrious!!