00:00Our own Charlie Gibson was there for their separation 19 years ago.
00:04You are so pretty. So pretty.
00:07It was a risky surgery with many nervous hours for the girl's parents, Melissa and Kevin.
00:13One moment that I'm completely dreading is leaving them in the OR.
00:17It was very hard. We didn't know after they were born if they would be able to survive.
00:21Only about one in every 50,000 conceptions are conjoined twins.
00:26Only one in 200,000 survived to birth.
