>> reporter: 240 stitches for rebecca, but her 3-year-old brother, brandon, suffered severe brain injuries. >> first of all, they said he might not live. and second of all, if he does live, he will never walk or talk again. >> reporter: brandon proved them wrong. >> i am brandon denny and i'm 18 years old. >> there you see yet another child being carried away. >> i stopped by the 7-eleven on the way to downtown and i bought some plastic bags with the intent to pick up my son's body. >> i'm chris nguyen, i'm 20 years old, and i survived the oklahoma city bombing. >> reporter: they are the youngest survivors of the deadliest act of homegrown terror on u.s. soil. children, now young adults, who tell us, time heals some, but not all wounds. >> when you go through something like this, it just doesn't go away. like, the next day or the next