jaffrey and rasel raihan. gomal suggested we start with one of their families. >> my theory was always was there is no way your kid would change from a normal person to a suicide bomber and no one notice any difference. >> on a small suburban street outside columbus, we found rasel's parents' home. can i talk to you for a minute? you don't want to talk to me? well, he clearly didn't want to speak. get lost was what he said. he said he was going to call the police. >> reporter: off camera, rasel's father told us he brought his children from bangladesh 16 years ago and has at times worked two jobs to support the family. he says he hasn't heard from rasel in two years and disavows what he's done. our team tracked down this video of rasel. >> he is such an outgoing kid. >> phil chu was one of his best friends in high school. >> he was an exceptional student. >> he wanted to go to harvard? >> yes, he wanted to be a doctor. he wanted to help people. >> in this video, rasel comes across as a typical teen. smart and e

>> reporter: what rasel had done was unthinkable.lready in syria. he didn't tell phil that. he did tell him who guided him on his path. >> i hate to make assumptions, i believe because that's what he specifically stated and talked to his sister, how he had gone to islam. >> reporter: so rasel had a sister. her name was zakiia and she clearly played a key role. it was her husband that traveled to syria with her little brother, rasel, a picture starting to e34er7b8g. >> what's the most mysterious is this connection, how did zakiia link up witho jofferey. >> reporter: we headed to california. jofrry agreed to meet with us in the park. >> no one was as close as jofrry was. >> reporter: he says jofrry was into rap music, marijuana and the internet until he started watching propaganda videos. >> he was getting angry and said we're surrounded by a bunch of sinful people and should move to a muslim country. >> reporter: he was getting more angry? >> more hateful towards americans. >> reporter: it was around that time akhmed says jofrry met a