Memoirs of a Finster is the third episode from Season 2.
On being given a family tree project Chuckie and Kimi are excited that they only have one piece of homework between them as they are brother and sister. However Kimi discovers her Japenese heritage and decides that she and Chuckie should work on seperate projects because she is studying all of her biological family side not her half father's side (Chuckie's dad). At first Chuckie is supportive of his sister but after she drags the Finster family into charade for the schools culture festival which humiliates them Chuckie becomes annoyed and wants his old sister back.
Meanwhile Tommy meets a new kid called Trevor who behaves a lot like him.