Mary E. DOSTER married Joseph Burton BLACK and had 9 children:
Allamath B. BLACK-1848 David Smith BLACK-Jan 1849 Margaret BLACK-1853 Martha Jane BLACK-12 Jan 1855 Mary "Polly" Addine BLACK-28 May 1857 Louisa A. BLACK-7 Apr 1860 Nancy Anne BLACK-7 Jun 1862 Rebecca BLACK-1867 James Burton BLACK-1869
I come down through Nancy Anne BLACK and can provide that info if needed.
Knowing that Mary was born in SC, I checked the 1790 census for SC and there is only one DOSTER listed.
Joshua DOSTER, Orangeburgh District, had 1 white male over 16 years old; 3 white males under 16 years old; & 3 free white females.I'm thinking this might be Mary's grandfather but too early to tell.
If you have anything to add, change, or berate me on, let me know.