Thanks for your response, Lynda!
The brothers are William and Robert. Their wives are Clementine and Amelia. Amelia is my great grandmorher. They were all on the Free Inhabitants list (I don't know if that list is for free Blacks or whites as 1860 census doesn't define) for 1860 Rapides Parish. None of them are found post 1860 except Amelia in the 1870 census, same location.