Katniss has a sister - Primrose(Prim) and a mother (idk her name) are her family. Her best friend Gale, Her friend Madge(the mayor's daughter) and Her friend Cinna (one of her stylists) are her friends. This is only from the first book. And in the first book I listed the people still alive. There is also Peeta, but as of the first book I'm not sure about his and Katniss's relationship because Katniss becomes confused when she gets back to district 12. She gets confused about her and Peeta's relationship.
Prim is here sister; I don't know her mom's name; Peeta (while partners in the Hunger Games, they become a couple); Here friend Gale ( a bit jealous of Peeta and Katniss) There are also a lot of people who died, like the girl she took care of who died, Rue.