life behind bars. in some cases, those bonds have existed their entire lives. over the years, "lockup" crews have discovered a surprising number of family members serving time together. but few have ever had to face the difficult circumstances that confronted yvette and doris. >> being on death row was -- it was like i needed -- i needed to be with my sister. >> the identical twins, both convicted of murder for helping yvette's former boyfriend carry out a triple homicide, were sent to the north carolina correctional institution for women. doris got a life sentence. yvette was condemned to die. she told us about her first day on death row. >> i begin to hear insults when i first got in the gate. i began to hear people talk about oh, she's got sentenced to death. oh, she's going to be -- she's going to die for the crimes that she committed. >> even though they were housed at the same prison, the women were prohibited from seeing one another.