Maxwell Kane is a teenager who lived with his Grim and Gram. Max's parents are both gone. His mom died because of his father, so his father is in prison for almost his whole life.
Max is a worried young man. In addition, it kills him not to see his best friend while he's suffering when he was in the hospital. It says, "They won't let me visit him the first day, and Gram says I'll just have to be patient and let the doctors do their business, but I can't stand just sitting around so I decide to walk over to the hospital, which Grim says is miles and miles, but suit myself " (Philbrick 147). This evidence shows that Max is very worried. It shows that he cares for his best friend, or more like a brother. It's also very hard for him to see him suffering because of his disease. Also, he just couldn't resist to visit Freak on the hospital because he really care about him since they have been together for almost everyday.