Diana, I found the following item in which you may have an interest.This Mary Ann would have been the sister of George born 1821.I have no DOB or DOD on Mary Ann.
FROM:History of Hancock County, OHIO Orange Township – p. 815
WILLIAM M. MARSHALL, farmer, P. O. Cordelia, born in Trumhull County, Ohio, August 8, 1815, is the eldest son of Benjamin and Jane (McKinley) Marshall, who were married in Trumhull County, Ohio, in 1814, and came to this county in 1838. Of their family only four sons and three daughters survive. The father died and the mother now resides in Union Township, this county. William M. Marshall married, November 7, 1839, Mary A. Vermillion, of Orange Township, this county. Her parents, George and Anna (Hardy) Vermillion, came to Hancock County about 1838. To our subject and wife have been born eight children: Anna J. (deceased); Benjamin G. ; James (deceased); Calvin W. ; Martin F. (deceased); Chancy C. (deceased); John W. (deceased) and Lydia D. Mr. Marshall has improved many acres of land in Orange Township, and has filled several of the township offices. He has also served the county in the office of commissioner. In politics he is a Democrat. Mr. Marshall is now a widower, his wife having died some time since.
If you have ever found any leads on the parents for George born 1781, I would appreciate knowing what you have found. George's place of birth i still undocumented as far as I know, but it appears from most sources that he was born in Maryland.
It appears that his wife's name was Anna B. Hardy, born June 20, 1777, in Maryland (and not Germany).I believe "Anney" was a nickname.Her middle name is debatable, but likely was Barbara or Barbarah and not Barbery or Barberry.Her surname is listed variously as Hardy, Harde, and Hardeo (this one from the LDS site, which has much misinformation about Vermillions). The Hancock County History is probably the most reliable source at this point in time for ascertaining her true name.