It has happened to a relatives' tree. The Bass family makes great effort to distinguished that they are not of African blood when in fact a funeral director in Durham, North Carolina remembers the blue eyed, wavy haired "mulatto" kids attending funerals for the white family memebers. He mentioned that they called each other cousin yet the white sat in the front of the church and the mulattos in the back.Then in research for Jason Bass was STOPPED because he married a mulatto black women (Taborn).Yet I found him and his kids in the census records. So the information was available but the truth hurt so they left it alone. Amazing how the facts are sorted to make people more secure. SMH.