Bellesou, I have info on your Isaac Robertson. Isaac was born I believe in Choctaw County, AL and his parents are William Robertson and Lavinia Sims and they were married May 27, 1821 in Mobile, Alabama. Lavinia Sims was the sister of my gr gr gr grandfather, Berry Sims. There are 4 other siblings of Lavinia and Berry.

Isaac had 2 sisters, Abigail and Amanda. In fact, if you look, I think next door to Isaac Robertson in the 1880 Decatur, GA census, Amanda and her husband Samuel Jefferson Middleton are living there. Isaac also had 2 brothers, William and Nicodemus. I don't have all the pertinent details because honestly, I just found out these people were related to me the day after Christmas. I am still filling in blanks myself. I have a little more information so if you want what I have up to this point, let me know. Please email me at cows4moochele@yahoo.com.
Thanks,
Michele