Your sister Kimi is 16, shes protective twords you, 

there's 4 people in the room two highschool boys and two highschool girls, 

one highschool boys Kyle is 16 and is mean.

the other highschool boy Nolan, he's 16 and is nice but is very concerned for everyones safety.

 one highschool girls Ashley is 16 and nice but very scared of the zombies.

the other highschool girl Yuki, shes 16 and is very brave and comes up with plans.