I think genetics play a huge part in who we are. Both personality wise and physically. I know everyone on my Dad's side is very argumentative. I'm like that. My mom is more easy going, my sister is like that. My sister has the 'family' nose. We have several health issues that have existed for generations and they continue on (they effect the members in the family with this condition identically, there has been NO variations). National Geographic is doing a project where they identify what migrational patterns your acestors had in the past. They go back over 20,000 years!!!!!! It's fascinating.