I worked with a lady whose daughter and son-in-law adopted 2 kids from Columbia. The girl has black hair but the mom is Italian so she really blends into the family. The boy is very dark tho, like a native. They were ecstatic just to be able to be parents.
There is an association made up of parents who have adopted children from Latin America. There are people from Scandinavian countries who do so also. It's all about wanting children and loving them. It's called LAPA, and IMO they should be vocal about this. I'll do some research.
I have a friend who grew up on Purto Ricco and her husband is from Peru .. 2 of their kids were born with black hair and 2 of their kids were born with blonde hair that eventually turned brown
Here's is another story ... I have a friend that had real blonde hair (like Jack Roberts) when he was little .. his hair is now jet black
The reason for me mentioning these things is because .. it is very possible for the Roberts kids hair will eventually turn dark as they get older