Do you realise you have posted your message on the Australian Message Board ?
I am not related but i have had a look and according to the 1880 USA census Dollie was the daughter of Augustus Peacock & Susan, I located a marriage for Augustus Peacock & Susan MULLIS 18/7/1845 Pulaskis Georgia.
In the 1880 census Augustus is listed as listed as aged 50 (born c 1830) farmer, white race born in NC father born in NC
Susan is listed as aged 54 (born c 1826) same details as her hubby
son William A Peacock aged 19
dau Susan A Peacock aged 15
Dolly A V Peacock aged 13
Living next door could be the son of Augustus & Susan
John Peacock aged 27
wife Ellen Peacock aged 28
dau Ann E aged 13
son James P Peacock aged 10
John C Peacock aged 1
Which means John became a father at aged 14.
Augustus Peacock seems to be the son of Bryant Peacock & Nancy
Susan Mullis may be the daughter of Blackstone Mullis & Mary Austin