How did Tina's death affect Teddy an why?

Tina's death affected Teddy by him wanting to get reveange. Teddy would see her lotion all over the place in his car, in the kitchen, near the computer, and inside everyones room, everytime he saw the lotion anger will build up inside him and he wanted to just do the same to the killer. It also affected Teddy when he saw the sadness in his family. I think that with Tina's death Teddy had gotten tougher and meaner, he would say that he would make Tina's killers' family suffer more than the Anderson. The main reason why Tina's death affected Teddy is that it's his own sister, his blood. I can connect with Teddy on the feeling of loseing someone in the family because I lost a cousin and I cried. I would also be very mad if I were to lose my sister or brother, but I wouldn't be as brave as Teddy and get reveange I would just cry. In the book Teddy remembered when Tina before going to sleep she would leave Teddy a sandwich to eat. No one else would make Teddy a sandwich not even his mom, that really hurt Teddy because he could see how much Tina loved and cared for him. Lastly, Teddy still has Tina's smile in his head from everytime that Teddy would pick Tina up in his car.