Mary Harlan was born 12 June 1709 in Kennett Township, Pennsylvania, United States to Ezekiel Harlan (1679-1731) and Ruth Buffington (1682-1744) and died 7 June 1750 Kennett Township, Pennsylvania, United States of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| George Webb (1731-1764) | 15 January 1731 Kennett Township, Pennsylvania, United States | 24 April 1764 Kennett Township, Pennsylvania, United States | Ann Swayne (1735-1764) |
Siblings
| Name | Birth | Death | Joined with |
| Mary Harlan (1709-1750) | 12 June 1709 Kennett Township, Pennsylvania, United States | 7 June 1750 Kennett Township, Pennsylvania, United States | Daniel Webb (1705-1741) |