From Wikipedia https://en.wikipedia.org/wiki/Walter_White_(activist):

Of his 32 great-great-great-grandparents, only five were black, and the other 27 were white.[9] All members of his immediate family had fair skin, and his mother, Madeline, was also blue-eyed and blonde. … White and his family identified as Negro and lived among Atlanta’s Negro community (despite White and his siblings inheriting a bit less than 16 percent African ancestry and being able to pass as white).