I have just happened to watch a documentary on BBC IPlayer...about twins separated at birth, and brought up in two very different cultures and environments. It is always interesting to watch these programmes about twins separated at birth to observe the interplay between nature and nurture - and the distinctive qualities of each of those factors.
These twins were both girls....born in China.....one was taken off to live in Sacramento, California in a typically middle class American family; the other was taken to live in a remote village in the northern reaches of Norway
Two very different families ( apart from both being two parents - mother & father....both of the mothers, however, were very much the 'primary' parent...but with the fathers still playing a supportive, though still nurturing role) and totally different environments/cultures/languages.
The programme saw the the American raised twin visit the Norwegian raised twin in Norway. by this time they are 10 years old, or thereabouts, and yet the similarities in personality, gesture and skill are remarkable. Both swam like fish, for a start.....beneath the surface of the fjord.
I've seen twin programmes before......and it is clear that culture can either inhibit or enable certain latencies or potentials in the nature, or shape the way they express.....but the latencies, the potentials and the genetics are always still there.