I see no problem in a family discussing the colour or other matters like height genes in future children in a mixed race marriage. My white daughter has a brown husband and we all speculated on these subjects. The kids' colour varied from white to light brown and the 2 boys got the height genes .I know many friends in similar circumstances who had the same discussions.
The issue here is the use of the word ' concerns" in the interview which puts whole new perspective on it. Its very easy to be offended you are looking for it and that word has sparked a media feeding frenzy. Possibly it was deliberate move to whip up sympathy. Your guess is as good as mine.