Basic: How characters are related in an adaptation differs from the original.
- Straight: In the book series The Tropers of TV, Alice and Claire are first cousins. In The Film of the Book they're sisters.
- Exaggerated: In the book Alice and Claire are very distantly related cousins via marriage rather than biology. In the film they're twin sisters.
- Downplayed: In the books Alice and Claire are cousins; in the film they're still technically cousins, but Claire was formally adopted by Alice's parents and raised with her, so legally and socially they're sisters.
- Justified:
- Alice and Claire are presented as being very close and treat each other like sisters in the book, so for the sake of compressing things the filmmakers just went ahead and made them sisters.
- Claire's father and Alice's father became a Composite Character in the film, so it makes sense to have him be the father of both characters.
- The best actresses to audition for Alice and Claire's roles in the adaptation were sisters, so the filmmakers decided to make their characters siblings as well.
- Inverted: Alice and Claire were cousins in the book but aren't related at all in the film.
- Subverted: The film makes it seem that Alice and Claire are sisters, but then confirms they're actually still cousins.
- Double Subverted: Alice and Claire believe they're cousins, but it's then revealed that Alice's father had an affair with Claire's mother and he's Claire's actual father, making them half-sisters. (A reveal which is absent from the books.)
- Parodied: In the original books Alice and Claire refer to each other as "Cousin" as a term of endearment. In the adaptation where they are siblings, Alice keeps using the term to annoy Claire and confuse everyone else.
- Zig-Zagged: The film never makes it entirely clear how Claire and Alice are related.
- Averted: Alice and Claire remain cousins in the film.
- Enforced: The film executives think the audience is too dense to figure out the nuances of Claire and Alice being cousins yet hanging out constantly, so they demand the writers make them sisters.
- Lampshaded: "Hey, aren't Alice and Claire closer than they used to be?"
- Invoked: ???
- Exploited: ???
- Defied: When selling the rights to the film of the book, the book's author adds a clause stating that the filmmakers may not change the blood relations between characters.
- Discussed: ???
- Conversed: "Hold on, I thought they were cousins in the original! Don't the filmmakers have any respect for the source material?"
