In order for Obama to be an octoroon he would have to have one white parent and one parent who was a quadroon, or a person who was only one quarter black. A quadroon has three grandparents who are white and one black grandparent. I think that it is unlikely that was the case with Barack Obama Sr.
For example, the late Eartha Kitt,who was half black, was married to a white man with whom she had a daughter. I'm pretty sure that her daughter would be considered a quadroon. I think that her granddaugher would be considered an octoroon. These terms tend to shift, but that is my interpretation.
