Here is some information on these families from Middlesex County, Virginia records:
Mary PETERS was the "Mullatto Woman Servant" of Edward Crouch on 5 July 1708 when she confessed in court to having a "Mullatto" child.
Middlesex County Will Books D,E, & F, LVA microfilm reel 22:
WB D, pages 545-6, I Thomas Hardin...to wife Lucy Hardin...the three Mulattas as follows: Molly PETERS, Lucy PETERS and Hannah PETERS during the time of their servitude. 17 November 1759. Proved 4 December 1759.
WB F, page 83, I Hannah Churchill...give to son Benjamin Churchill...William SYPHAX until the said William shall be free. To my daughter Betty Jones...Betty SYPHAX, Caty SYPHAX, and Peggy WILLIAMS until they are free. 15 March 1776. Proved 25 November 1776.
(Therefore, they were indentured servants).
WB F, page 233 I William PETERS...to my mother Lucy PETERS if living at my decease one cow that gives milk.
To my wife Haney PETERS all my whole estate. After the decease of my wife to Mary DUNGEE, daughter of my wife, but in case the said Mary DUNGEE should die without heirs, then I give unto James Peters. Loving wife Haney Peters and John DUNGEE executors. 8 January 1782. Proved 24 June 1782. Executors qualified on bond of 300 pounds currency. Haney Peters (signing) returned an inventory of the estate which included 10 cattle, a horse, 2 beds and furniture, a pair of cart wheels, grindstone, 4 chairs, a hoe and a saw.
WB B, page 379-380: Inventory of John Price, Gentleman, 6 April 1731:
A Molatoe Servant Girl named Ann Whisler 12 Pounds currency
A Molatoe Servant Girl named Betty Whisler 12 pounds
Will Whisler a servant boy 18 pounds.
WB B, page 307, Inventory of John Berry, 7 March 1726/7:
Servants: 1 Mollatto girl called Betty 8 pounds
1 Mollatto girl called Lucy 12 pounds.
WB A, page 103, Inventory of Major Robert Dudley, 3 November 1701
One Mallato woman, 2 years to serve. 2 pounds.
WB A, page 208, Inventory of Robert Deputy, 25 October 1708:
1 Mulatto Girle named Jeane born of an English woman, aged about 13 years - 30 pounds.