My Brazilian wife's great-grandparents were Curtis GRADY and Sarah GRADY (nee Sarah Rush DURHAM) who emigrated to Brazil from US about 180 along with about 10 children (including a Sarah and twins Curtis and Greg). It has always been believed that they came from Georgia, where their plantations were lost during/after the Civil War, and that Curtis was related to the well-known Henry Woodfin GRADY of Athens Ga - perhaps a brother, but more likely a cousin. It seems that the Gradys of Athens may have moved south from N Carolina around 1800 but maybe later..
We are rather far away from US sources here in England. Can you help or
provide any advice please?