I am seeking information on my great-grandmother and her sister my great-great-aunt.
Great-grandmother: maiden name - Alverta J. Skidmore; she was born in Stafford County VA. Her birth date was 27 February either (1851 - census data) or (1853 - legal deposition given in 1892) or (1855 or 56 - death certificate). Her death certificate lists her father's name as William and mother 'unknown', although her parents may have been Harrison and Jane Skidmore. By 1870, Alverta was working as a domestic in Georgetown. In 1874 Alverta, along with Pryor A. (her sister) and Patrick H. Skidmore all lived at 118 High Street in the District of Columbia. In 1875, Alverta married Henry Grine and moved to Maryland.
Great-great-aunt: Pryor Ann Skidmore she was born 15 March 1858 in Stafford County, her parents are Harrison J. and Jane Skidmore according to the Stafford County Register of Births 1853-1877. On her death certificate both parents are listed as 'unknown.'
I am looking for any additional information on these two individuals.
Alverta's name is frequently spelled as 'Alberta.'
Any additional information/guidance would be appreciated.