i am black, my husband is white, our son is, as he says in his 3 year old wisdom "kinda whitish--tan".
people who don't know us say DS looks "just like his dad". those who know us well can tell, though my sons skin color may be more like his dads, his features(and hair) are mine.
At first glance to strangers im sure they dont see beyond the obvious. i can understand though to have the validations that you get from others noticing the resemblance.