Mary Sands Thomas was born 12 February 1740 in Church Hill, Queen Anne's County, Maryland, United States to Thomas Sands (1714-1775) and Elizabeth Swift (1712-1767) and died 1817 Marlboro County, South Carolina, United States of unspecified causes. She married Robert Thomas (1733-1817) 13 October 1756 in St Lukes Church, Church Hill, Queen Anne's County, Maryland.
Children
| Name | Birth | Death | Joined with |
| Tristram Thomas (1757-1767) | |||
| Elizabeth Thomas (1759-1800) | 12 December 1759 Queen Anne's County, Maryland, United States | 1800 Marlboro County, South Carolina, United States | John Covington (1752-1797) |
| Nathan Thomas (1762-1842) | 22 July 1762 Hebron, Marlboro County, South Carolina, United States | 27 September 1842 Hebron, Marlboro County, South Carolina, United States | Nancy Bingham (1763-1808) Celia Stuart (1762-1847) |
| Sarah Thomas (1765-1842) | |||
| John Sands Thomas (1768-1834) | |||
| Lucy Thomas (1770-) | |||
| Robert Thomas (1773-1843) | |||
| Elijah Thomas (1775-1849) | |||
| William Thomas (1777-1835) | |||
| Jesse James Thomas (1780-1838) | |||
| Eli Thomas (1783-1854) | |||
| Benjamin Thomas (1786-1815) | |||
Siblings