“The kid and the family probably won’t even know he’s “black””
You don’t think he’ll look at a family picture someday? Really?
You don’t think he might trace a family tree some day? Get checked for a disease that the rest of the family doesn’t have to worry about (and vice/versa? Get asked constantly who his “real” parents were?
We can’t create your own reality no matter how hard we try.
I’ve seen it before, numerous times -
when kids act the same within the same set of behavioral expectations,
something insignificant like relative melanin gets ignored.