>>149894562>>149889544 (OP)>>149904005>>149909824I'm gonna sperg here, so bear with me
The reason why Graham and Palmer look white is because they are genetically far more caucasian than just 75%. We don't get 25% from each grandparent, that's why brothers look different we all get different proportions of DNA from each grandparent.
So in their cases they are related to their black grandfathers in like 15% tops, maybe even 10%, in fact there is a 1 in a billion chance that you are not related to one of your grandparents at all.
So yeah, they are basically white, the only classification that has any sense are mulattos since they are always 50/50 but with quadroons and octaroons it can vary a lot, another example is that prison break guy.