. >> we were present when gary childers who was undergoing treatment for cancer came to visit his son. >> my mri was negative. my c.a.t. scan did show something. >> it's always hard to visit him in the jail. it's the roughest time. because i've done everything to keep him out, but he's a hard head. i did time. that wasn't a lifestyle. that was a journey into self-destruction. >> how did you feel, dad, when i walked in on the yard? >> i felt [ bleep ]. it was one of the toughest yards in the system. people got killed there. then here comes my son. something else to worry about. a lot of people get along well if they have their family in the yard. but if you're doing a lot of time, you're old school, an old-timer, we have rules we live by. then they bring your son in. there's something they can use against you, that's a weakness, and you're always looking for a weakness to prey on you. so here comes this one. not only do you have to be concerned about what you're doing, make sure you're doing everything right, now you have to worry about him doing everything right. one time was enough f