Elizabeth Pratt Backus was born 1 February 1641 in Old Saybrook, Hartford County, Connecticut to William Pratt (1609-1678) and Elizabeth Clarke (1618-1678) and died 26 February 1726 Norwich, New London County, Connecticut of unspecified causes. She married William Backus (1634-1721) 11 May 1664 in Hartford, Hartford County, Connecticut.
Children
| Name | Birth | Death | Joined with |
| Samuel Backus (1665-1715) | |||
| Joseph Backus (1667-1740) | 6 September 1667 Norwich, New London County, Connecticut, United States | 23 December 1740 Norwich, New London County, Connecticut, United States | Elizabeth Huntington (1669-1762) |
| Nathaniel Backus (1669-1728) | |||
| Elizabeth Backus (1670-1728) | 1670 Norwich, New London County, Connecticut, United States | 29 December 1728 Windham, Windham County, Connecticut, United States | Thomas Huntington (1664-1732) |
| Hannah Backus (1676-1752) | 1676 New London, New London County, Connecticut | 22 February 1752 Norwich, New London County, Connecticut | Thomas Bingham (1667-1720) Daniel Tracy (1652-1728) Samuel Griswold (1665-1740) |
| Mary Backus (1677-1752) | |||
Siblings
| Name | Birth | Death | Joined with |
| Elizabeth Pratt (1641-1726) | 1 February 1641 Old Saybrook, Hartford County, Connecticut | 26 February 1726 Norwich, New London County, Connecticut | William Backus (1634-1721) |
| John Pratt (1644-1726) | 20 February 1644 Connecticut | 1726 Connecticut | Sarah Jones |
| Joseph Pratt (1648-1703) | 1 August 1648 Saybrook, Middlesex County, Connecticut | 12 August 1703 Hebron, Tolland County, Connecticut | Margaret Parker (1650-1681) Sarah Chapman (1657-1701) |
| Samuel Pratt (1655-1683) | 6 October 1655 Hartford, Hartford County, Connecticut | 11 February 1683 Saybrook, Middlesex County, Connecticut | Ruth Huntington (1653-1684) Elizabeth Peck (1669-1688) |
| Sarah Pratt (1658-) | |||