Im very mixed, my father is african american and my mom is puerto rican, portuguese and native american and I have 4a hair. One of aunts on my fathers side of the family (she is also african american) and has 3c hair. 3b hair isnt just a mixed thing because I know plenty of other mixed people that dont have 3b hair also. AND I once knew a boy in high school who was irish and italian, and had blonde 3c hair.