Well, you see, my mother and my father fell in love and did what young people do when they are married and in love. <g> Being brown-eyed persons, their offspring all had various shades of brown, with the exception of one boy who was born blond haired, blue eyed, sharp as a tack and terribly obedient ...
In our family, my father's side being from Oklahoma, half the children are born blond, the other half dark, and out of five kids we have three blonds, but one blue eyes to go with that.
If I remember the biology correctly, it is called a recessive gene.
All very interesting, normal stuff <g> ... LOL