[Sloth]

I'm not sure you grasp the genetics involved. It is entirely possible for your sisters-in-law's families to have dark coloring and still carry recessive blond-hair/blue-eye genes.

[twigs]

Obviously, I don't. I thought when a recessive gene mated with a dominant one, the dominant one prevailed. So you are saying that the recessive one can manifest itself. And still be carried on as a recessive gene and later manifest itself? I would like to understand genetics, but have some learning to do. Thanks.