I have often wondered long and hard about the nature, nurture argument! Having had identical twins, it is sometimes hard to get your head around not only the fact that your TWO children should have only been one, but also how they can differ so drastically when they were essentially the same egg.
The more the girls grow up, the more I believe the nature argument wins. I believe that nature provides the personalities of a foetus way before a parent can nurture them. For example, Monkey was the restless one in the womb; the consultant noted on a few occasions, that she was kicking her sister while I was having my scans.