Mary Clothier Thomas was born 5 January 1710 in Talbot County, Maryland, United States to Robert Clothier (1680-1717) and Jane Kemp (1686-1723) and died 1767 Queen Anne's County, Maryland, United States of unspecified causes. She married Stephen Thomas (1705-1774) 5 January 1730 in Third Haven, Talbot County, Maryland, United States.
Children
| Name | Birth | Death | Joined with |
| Sarah Thomas (1731-1826) | |||
| Robert Thomas (1733-1817) | 26 September 1733 Queen Anne, Talbot County, Maryland, United States | 1817 Britton's Neck, Marion County, South Carolina, United States | Mary Sands (1740-1817) |
| Stephen Thomas (1736-1808) | |||
| Mary Thomas (1738-1774) | |||
| William Thomas (1741-1800) | 31 January 1741 Queen Anne's County, Maryland, United States | 1800 Richmond County, North Carolina, United States | Hannah Pratt (1740-1785) Rachel Roe (1756-1810) |
| John Thomas (1743-1814) | |||
| Susan Thomas (1745-1809) | |||
| Elizabeth Thomas (1747-1790) | |||
| Lewis Thomas (1750-1826) | |||
| Tristram Thomas (1752-1817) | |||
| Philemon Thomas (1754-1797) | |||
| Benjamin Thomas (1756-1833) | |||
| James Clothier Thomas (1758-1790) | |||
| Rebecca Thomas (1760-1802) | |||
Siblings
| Name | Birth | Death | Joined with |
| Robert Knapp Clothier (1707-1775) | 13 June 1707 Queen Anne, Maryland, United States | 20 June 1775 Chestertown, Maryland, United States | Elizabeth Hamer (1711-1789) |