I'm rather interested in the nature versus nurture question. How much of our inherent personality is the result of our genes and how much depends upon our upbringing and environment?
Our children are of similar colouring, but quite different in physical shape and personality. Son 2 has inherited a faulty gene from me, along with my persistance and bloody mindedness, while son 1 is quieter and more easygoing. Son 1 has always been the spitting image of his father, so much so that I have often seriously wondered if he has any of my genes at all.
So why is it that when I look at his body language and facial expressions and listen to him talking, I now see his uncle (Hubby's brother) so clearly? He only sees his uncle about once a year. This can only be nature shaping him.