I, too saw the documentary a few years ago, and was struck then, as now, how much of a "one person" they are. Identical twins after all are , I feel, two sides of one person. One being left handed, one right. They, as well as these girls seem to start and finish a sentence independantly and automatically and often register each others pain and sorrow.
I just wish and pray for them in the future and hope that life stays sweet for them. If they were my girls I would be so proud of them!