I know exactly how you are feeling right now. I just lost one of my baby kittens Tuesday night. I still cry thinking about her. But I remember that she is in a happy place and that all of my pets from my childhood that passed away years ago are with her. Rebel is not alone. He is Rainbow Bridge with all the other pets who have gone before him. He will wait there until your time to join him. Spend alot of time with Roxey. Yes, she does know, just like Salem knows that his sister is gone. Love her, pet her, talk to her. Let her remeber that you are there. And it's okay to be angry at the car. I was when I lost my cat Jake years ago because he was hit. I still can get angry and it happened eight years ago. It takes time. Things won't ever be the same, but one day you will think of Rebel and you will be able to smile. Our thoughts and prayers are with you until that day comes.