One of the characters

Kattnis sister Prim.
She is a tiny girl in the age of 15.
She lives with Kattnis her mum, her cat Buttercup and a sheep named Lady.
In the first book The Hunger Games became her name drawn when they where going to pic one girl and one boy for the game but Kattnis took her place instead.
She is not a big part of the book but Kattnis is thinking a lot of her in the book.