I have a Sadie Scott b.1868 in Linn County Iowa. Her father was a former slave from Kentucky George W. Scott who had an alias George W. Phillips. George W. Scott was himself mullatto and listed that way on several census records. He married my ggggaunt, a white woman, Emily L. Allard in Iowa. Though Sadie was 1/4 African American she is listed on later census as white. She also married and white man and had a number of children who are all listed as white. I have records for George W. Scott if you are interested in these let me know.