Mercy Knowles Godfrey was born 4 August 1717 in Chatham, Barnstable County, Massachusetts to Richard Knowles (1688-1769) and Martha Cobb (1682-1763) and died 14 May 1758 Chatham, Barnstable County, Massachusetts of unspecified causes. She married George Godfrey (1707-1768) 1 November 1733 in Massachusetts.
Children
| Name | Birth | Death | Joined with |
| Martha Godfrey (1734-1816) | |||
| Knowles Godfrey (1735-1766) | 1735 Chatham, Barnstable County, Massachusetts, United States | 19 January 1766 Chatham, Barnstable County, Massachusetts, United States | Jerusha Ryder (1739-1766) |
| Richard Godfrey (1735-1808) | |||
| Benjamin Godfrey (1737-1787) | |||
| Mary Godfrey (1740-1788) | |||
| James Godfrey (1741-) | |||
| Johathan Godfrey (1743-) | |||
| George Godfrey (1745-1769) | |||
| James Godfrey (1747-1779) | |||
| Sarah Godfrey (1750-) | |||
| Molly Godfrey (1753-) | |||
| Jonathan Godfrey (1755-) | |||
Siblings
| Name | Birth | Death | Joined with |
| Richard Knowles (1715-1736) | |||
| Mercy Knowles (1717-1758) | 4 August 1717 Chatham, Barnstable County, Massachusetts | 14 May 1758 Chatham, Barnstable County, Massachusetts | George Godfrey (1707-1768) |
| James Knowles (1719-1781) | |||
| Cornelius Knowles (1722-1794) | |||
| Rebakah Knowels (1723-1784) | |||