he said, i don't know, patimas, these are my children. and then his wife grabs the tv screen and starts screaming, it can't be. it can't be happening. i don't believe it. the children are there. i would have cried out myself. nick payton walsh, cnn. >>> in fact, family and friends have been a key part of the investigation so far as the fbi tries to piece together every bit of information it can. >> but it's been hard to get a view of what the brothers are like because there are a lot of conflicting views and opinions. take a listen to the suspect's mother. >> impossible. impossible for them -- for both of them to do such thing really, really, really feeling this is not an act. my son would not kill it so i would know whoever would be, you know, knowing -- anyone who would know, it would be me. >> mother says it's impossible. she said it's a setup. she knows them better than anyone and it's all a mistake. >> you can imagine how she must feel. here's a high school classmate. >> he was a regular teenager to me. he was quiet. you know, just r