Hi Karla, Below is my research on the family of Marshall F Brightwell & Martha Hatcher.Marshall's sister Frances Susan Brightwell-Hannay was my GGGgm.
As you can see, I have almost nothing regarding your ancestor Sarah Brightwell-White.I would love to know when and where she died and her children's names.
What information from the 1850 census has you confused?I have never found Marshall in the 1850 census anywhere.
Marshall F Brightwell (b.ca.1813 Oglethorpe Co GA-d.Apr 1870 Bartow Co GA) md 1844 DeKalb Co GA to Martha Hatcher (b.ca.1829SC-d.28 Mar 1921 Bartow Co GA). Census: 1850-??, 1860 Cass Co GA; 1870-1920 Bartow Co GA. (The name of Cass Co changed to Bartow Co in the 1860's)
1.Elizabeth "Lizzie" Brightwell (b.ca.1845-d.(1910-1923)) md 1869 Bartow Co GA to Augustus "Gus" Sanders.No children.
2.Sarah Brightwell (b.ca.1847-d.(1866-1923) md 1866 Cherokee Co GA to Martin White.
3.William Archer Brightwell (b.1849-d.29 Mar 1923) md 6 Jan 1876 Bartow Co GA to Lula Keys (b.18__-d.(1880-1900)). Buried Westview Cemetery, Atlanta, GA.
4.Emma Brightwell (b.ca.1852-d.(1921-1923) md 25 Jan 1877 Bartow Co Ga to Henry Maddox (d.(1877-1880)).
5.J (f) Brightwell (b.ca.1854-liv 1860)
6.Eliza Annie Brightwell (b.ca.1856-d.(1910-1915)) md 24 Sep 1873 Bartow Co GA to Edward P Cullinane
7.John? A (f) Brightwell (b.ca.1859-liv 1870)
8.D (f) Brightwell (b.ca.1859-d.(1860-70))
9.Arbella "Bell" Brightwell (b.1860-d.(1880-1923)) md 22 Feb 1876 Bartow Co GA to Pinkney Reeves (b.18__-liv 1880)
10.John B Brightwell (b.1862/4-d.22 Jan 1942 Chatham Co GA) md: a)?? Anna Durham 1881 Cobb Co GA b)Roxie _____ (liv 1920)-divorced before 1920
11.Mary Ellen Brightwell (b.1866/7-d.1950) md John M Hall.
12.Thomas Brightwell (b.1869-d.(1893-1900)) md 1893 Bartow Co GA to Lula Maxwell.
*****************************************************Obituaries: Atlanta Constitution William Archer Brightwell 1923 buried Westview Cemetery-Atlanta son-Charles M Brightwell-Boston Mass -Roy L Brightwell-Atlanta sis-Mrs John Hall-Acworth bro-John Brightwell-Savannah pallbearers: M G Phelan, R F Culinane, J C Harrison, W W King, J W Bedford, E O Sherman
Atlanta Constitution Roy L Brightwell d.11 Apr 1942 wife- bro-Charles M Brightwell-New York City (has a wife) Buried Westview Cemetery-Atlanta pallbearers-Harvey Harrison, Carter Harrison, W H Badon, A Q Dobbs, A L Bowers
Savannah Morning News John B Brightwell 1942 son-Leo A Brightwell-Jacksonville (FL?) dau-Mrs George Adams-Jacksonville (FL?) sis-Mrs John Hall-Ackworth gson-Leo Brightwell Jr-Richmond VA -George Adams Jr-Jacksonville (FL?)Buried Laurel Grove Cemetery