I have a couple of cousin siblings. Both, obvi, are 3/4 White, 1/4 Black. The eldest is a girl who looks 1/2 black, mocha brown skin, soft curly hair. The younger brother looks pretty much fully white/italian, dark blonde (probs brown these days as he has gotten older) loose curly, soft hair, both of them have fine facial features; more so the boy who has thinner lips... The same mum (1/2 black and white, looks milk-choc black/mixed race) and dad (full white italian)....
Just the way the genetic cookie crumbles.
My family on my mothers side, including all of my maternal cousins etc jokingly gets called the Heinz family, as all of our skin shades resemble 57 varieties, ranging from blonde haired blue eyed, to middle eastern looking, lots of shades of brown, and very dark, almost black. We are all 'mixed race' to varying degrees, as our parents (who are siblings) are 'mulattos' who have had children with partners from different racial backgrounds... Awesomsuace TL;DR
:Race is clearly more than just the skin tone you have, it is the family, genetics, culture and external reactions to your perceived race that all add to the mix of how a person's racial background is socially classified.