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 Japanese heritage and decides that she and Chuckie should work on separate projects, because she is studying all of her biological family's 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 a charade for the schools culture festival, which humiliates them, Chuckie feels forsaken and wants his old sister...