here they are with ted koppel.john lost two sons here, john and joe. >> john, i mean, your pain is almost impossible to imagine. you lost both your sons here. >> only two sons. >> only two sons. one cop, one fireman? >> yes, sir. >> you lost -- >> my son tom. >> he was with the fire department? >> yes. >> have you found him? >> no. still looking. >> reporter: bill butler's son tom was never found. >> feels like yesterday. >> reporter: nine years ago? >> right. feels like yesterday. >> reporter: dennis' son also died here. >> both emotional and basically terrifying, because i worked that day, i was on my way to the south tower when it came down, so, it's got -- i have -- and my son was never recovered, so -- it's even more emotional. >> reporter: i have a 12-year-old son, and i look at the four of you and i think, i couldn't bear it. i couldn't bear it. >> i can't bear it. people said to us, well, how do you feel now after nine years? haven't seen my son in nine years. that's all. >> reporter: so time doesn't heal a